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-rw-r--r--common.c2038
1 files changed, 12 insertions, 2026 deletions
diff --git a/common.c b/common.c
index 72c6c45..b920c33 100644
--- a/common.c
+++ b/common.c
@@ -18,81 +18,25 @@
*
*/
-#define _POSIX_C_SOURCE 199309L
-#define _XOPEN_SOURCE 600
+#define LIBERTY_WANT_SSL
+#define LIBERTY_WANT_POLLER
-#include <stdio.h>
-#include <stdlib.h>
-#include <errno.h>
-#include <string.h>
-#include <stdarg.h>
-#include <stdint.h>
-#include <stdbool.h>
-#include <ctype.h>
-#include <time.h>
-#include <limits.h>
+#define print_fatal_data ((void *) LOG_ERR)
+#define print_error_data ((void *) LOG_ERR)
+#define print_warning_data ((void *) LOG_WARNING)
+#define print_status_data ((void *) LOG_INFO)
+#define print_debug_data ((void *) LOG_DEBUG)
-#include <unistd.h>
-#include <sys/wait.h>
-#include <sys/stat.h>
-#include <sys/time.h>
-#include <fcntl.h>
-#include <poll.h>
-#include <signal.h>
-#include <strings.h>
-#include <regex.h>
-#include <libgen.h>
-#include <syslog.h>
-#include <fnmatch.h>
-
-#include <sys/socket.h>
-#include <sys/types.h>
-#include <netinet/in.h>
-#include <netdb.h>
-
-#ifndef NI_MAXHOST
-#define NI_MAXHOST 1025
-#endif // ! NI_MAXHOST
-
-#ifndef NI_MAXSERV
-#define NI_MAXSERV 32
-#endif // ! NI_MAXSERV
-
-#include <getopt.h>
-#include <openssl/ssl.h>
-#include <openssl/err.h>
-#include "siphash.h"
-
-extern char **environ;
-
-#ifdef _POSIX_MONOTONIC_CLOCK
-#define CLOCK_BEST CLOCK_MONOTONIC
-#else // ! _POSIX_MONOTIC_CLOCK
-#define CLOCK_BEST CLOCK_REALTIME
-#endif // ! _POSIX_MONOTONIC_CLOCK
-
-#if defined __GNUC__
-#define ATTRIBUTE_PRINTF(x, y) __attribute__ ((format (printf, x, y)))
-#else // ! __GNUC__
-#define ATTRIBUTE_PRINTF(x, y)
-#endif // ! __GNUC__
-
-#if defined __GNUC__ && __GNUC__ >= 4
-#define ATTRIBUTE_SENTINEL __attribute__ ((sentinel))
-#else // ! __GNUC__ || __GNUC__ < 4
-#define ATTRIBUTE_SENTINEL
-#endif // ! __GNUC__ || __GNUC__ < 4
-
-#define N_ELEMENTS(a) (sizeof (a) / sizeof ((a)[0]))
-
-#define BLOCK_START do {
-#define BLOCK_END } while (0)
+#include "liberty/liberty.c"
// --- Logging -----------------------------------------------------------------
static void
-log_message_syslog (int prio, const char *quote, const char *fmt, va_list ap)
+log_message_syslog (void *user_data, const char *quote, const char *fmt,
+ va_list ap)
{
+ int prio = (int) (intptr_t) user_data;
+
va_list va;
va_copy (va, ap);
int size = vsnprintf (NULL, 0, fmt, va);
@@ -105,1652 +49,6 @@ log_message_syslog (int prio, const char *quote, const char *fmt, va_list ap)
syslog (prio, "%s%s", quote, buf);
}
-static void
-log_message_stdio (int prio, const char *quote, const char *fmt, va_list ap)
-{
- (void) prio;
- FILE *stream = stderr;
-
- fputs (quote, stream);
- vfprintf (stream, fmt, ap);
- fputs ("\n", stream);
-}
-
-static void (*g_log_message_real) (int, const char *, const char *, va_list)
- = log_message_stdio;
-
-static void
-log_message (int priority, const char *quote, const char *fmt, ...)
- ATTRIBUTE_PRINTF (3, 4);
-
-static void
-log_message (int priority, const char *quote, const char *fmt, ...)
-{
- va_list ap;
- va_start (ap, fmt);
- g_log_message_real (priority, quote, fmt, ap);
- va_end (ap);
-}
-
-// `fatal' is reserved for unexpected failures that would harm further operation
-
-#define print_fatal(...) log_message (LOG_ERR, "fatal: ", __VA_ARGS__)
-#define print_error(...) log_message (LOG_ERR, "error: ", __VA_ARGS__)
-#define print_warning(...) log_message (LOG_WARNING, "warning: ", __VA_ARGS__)
-#define print_status(...) log_message (LOG_INFO, "-- ", __VA_ARGS__)
-
-#define exit_fatal(...) \
- BLOCK_START \
- print_fatal (__VA_ARGS__); \
- exit (EXIT_FAILURE); \
- BLOCK_END
-
-// --- Debugging and assertions ------------------------------------------------
-
-// We should check everything that may possibly fail with at least a soft
-// assertion, so that any causes for problems don't slip us by silently.
-//
-// `g_soft_asserts_are_deadly' may be useful while running inside a debugger.
-
-static bool g_debug_mode; ///< Debug messages are printed
-static bool g_soft_asserts_are_deadly; ///< soft_assert() aborts as well
-
-#define print_debug(...) \
- BLOCK_START \
- if (g_debug_mode) \
- log_message (LOG_DEBUG, "debug: ", __VA_ARGS__); \
- BLOCK_END
-
-static void
-assertion_failure_handler (bool is_fatal, const char *file, int line,
- const char *function, const char *condition)
-{
- if (is_fatal)
- {
- print_fatal ("assertion failed [%s:%d in function %s]: %s",
- file, line, function, condition);
- abort ();
- }
- else
- print_debug ("assertion failed [%s:%d in function %s]: %s",
- file, line, function, condition);
-}
-
-#define soft_assert(condition) \
- ((condition) ? true : \
- (assertion_failure_handler (g_soft_asserts_are_deadly, \
- __FILE__, __LINE__, __func__, #condition), false))
-
-#define hard_assert(condition) \
- ((condition) ? (void) 0 : \
- assertion_failure_handler (true, \
- __FILE__, __LINE__, __func__, #condition))
-
-// --- Safe memory management --------------------------------------------------
-
-// When a memory allocation fails and we need the memory, we're usually pretty
-// much fucked. Use the non-prefixed versions when there's a legitimate
-// worry that an unrealistic amount of memory may be requested for allocation.
-
-// XXX: it's not a good idea to use print_message() as it may want to allocate
-// further memory for printf() and the output streams. That may fail.
-
-static void *
-xmalloc (size_t n)
-{
- void *p = malloc (n);
- if (!p)
- exit_fatal ("malloc: %s", strerror (errno));
- return p;
-}
-
-static void *
-xcalloc (size_t n, size_t m)
-{
- void *p = calloc (n, m);
- if (!p && n && m)
- exit_fatal ("calloc: %s", strerror (errno));
- return p;
-}
-
-static void *
-xrealloc (void *o, size_t n)
-{
- void *p = realloc (o, n);
- if (!p && n)
- exit_fatal ("realloc: %s", strerror (errno));
- return p;
-}
-
-static void *
-xreallocarray (void *o, size_t n, size_t m)
-{
- if (m && n > SIZE_MAX / m)
- {
- errno = ENOMEM;
- exit_fatal ("reallocarray: %s", strerror (errno));
- }
- return xrealloc (o, n * m);
-}
-
-static char *
-xstrdup (const char *s)
-{
- return strcpy (xmalloc (strlen (s) + 1), s);
-}
-
-static char *
-xstrndup (const char *s, size_t n)
-{
- size_t size = strlen (s);
- if (n > size)
- n = size;
-
- char *copy = xmalloc (n + 1);
- memcpy (copy, s, n);
- copy[n] = '\0';
- return copy;
-}
-
-// --- Double-linked list helpers ----------------------------------------------
-
-#define LIST_HEADER(type) \
- struct type *next; \
- struct type *prev;
-
-#define LIST_PREPEND(head, link) \
- BLOCK_START \
- (link)->prev = NULL; \
- (link)->next = (head); \
- if ((link)->next) \
- (link)->next->prev = (link); \
- (head) = (link); \
- BLOCK_END
-
-#define LIST_UNLINK(head, link) \
- BLOCK_START \
- if ((link)->prev) \
- (link)->prev->next = (link)->next; \
- else \
- (head) = (link)->next; \
- if ((link)->next) \
- (link)->next->prev = (link)->prev; \
- BLOCK_END
-
-// --- Dynamically allocated string array --------------------------------------
-
-struct str_vector
-{
- char **vector;
- size_t len;
- size_t alloc;
-};
-
-static void
-str_vector_init (struct str_vector *self)
-{
- self->alloc = 4;
- self->len = 0;
- self->vector = xcalloc (sizeof *self->vector, self->alloc);
-}
-
-static void
-str_vector_free (struct str_vector *self)
-{
- unsigned i;
- for (i = 0; i < self->len; i++)
- free (self->vector[i]);
-
- free (self->vector);
- self->vector = NULL;
-}
-
-static void
-str_vector_reset (struct str_vector *self)
-{
- str_vector_free (self);
- str_vector_init (self);
-}
-
-static void
-str_vector_add_owned (struct str_vector *self, char *s)
-{
- self->vector[self->len] = s;
- if (++self->len >= self->alloc)
- self->vector = xreallocarray (self->vector,
- sizeof *self->vector, (self->alloc <<= 1));
- self->vector[self->len] = NULL;
-}
-
-static void
-str_vector_add (struct str_vector *self, const char *s)
-{
- str_vector_add_owned (self, xstrdup (s));
-}
-
-static void
-str_vector_add_args (struct str_vector *self, const char *s, ...)
- ATTRIBUTE_SENTINEL;
-
-static void
-str_vector_add_args (struct str_vector *self, const char *s, ...)
-{
- va_list ap;
-
- va_start (ap, s);
- while (s)
- {
- str_vector_add (self, s);
- s = va_arg (ap, const char *);
- }
- va_end (ap);
-}
-
-static void
-str_vector_add_vector (struct str_vector *self, char **vector)
-{
- while (*vector)
- str_vector_add (self, *vector++);
-}
-
-static void
-str_vector_remove (struct str_vector *self, size_t i)
-{
- hard_assert (i < self->len);
- free (self->vector[i]);
- memmove (self->vector + i, self->vector + i + 1,
- (self->len-- - i) * sizeof *self->vector);
-}
-
-// --- Dynamically allocated strings -------------------------------------------
-
-// Basically a string builder to abstract away manual memory management.
-
-struct str
-{
- char *str; ///< String data, null terminated
- size_t alloc; ///< How many bytes are allocated
- size_t len; ///< How long the string actually is
-};
-
-/// We don't care about allocations that are way too large for the content, as
-/// long as the allocation is below the given threshold. (Trivial heuristics.)
-#define STR_SHRINK_THRESHOLD (1 << 20)
-
-static void
-str_init (struct str *self)
-{
- self->alloc = 16;
- self->len = 0;
- self->str = strcpy (xmalloc (self->alloc), "");
-}
-
-static void
-str_free (struct str *self)
-{
- free (self->str);
- self->str = NULL;
- self->alloc = 0;
- self->len = 0;
-}
-
-static void
-str_reset (struct str *self)
-{
- str_free (self);
- str_init (self);
-}
-
-static char *
-str_steal (struct str *self)
-{
- char *str = self->str;
- self->str = NULL;
- str_free (self);
- return str;
-}
-
-static void
-str_ensure_space (struct str *self, size_t n)
-{
- // We allocate at least one more byte for the terminating null character
- size_t new_alloc = self->alloc;
- while (new_alloc <= self->len + n)
- new_alloc <<= 1;
- if (new_alloc != self->alloc)
- self->str = xrealloc (self->str, (self->alloc = new_alloc));
-}
-
-static void
-str_append_data (struct str *self, const void *data, size_t n)
-{
- str_ensure_space (self, n);
- memcpy (self->str + self->len, data, n);
- self->len += n;
- self->str[self->len] = '\0';
-}
-
-static void
-str_append_c (struct str *self, char c)
-{
- str_append_data (self, &c, 1);
-}
-
-static void
-str_append (struct str *self, const char *s)
-{
- str_append_data (self, s, strlen (s));
-}
-
-static void
-str_append_str (struct str *self, const struct str *another)
-{
- str_append_data (self, another->str, another->len);
-}
-
-static int
-str_append_vprintf (struct str *self, const char *fmt, va_list va)
-{
- va_list ap;
- int size;
-
- va_copy (ap, va);
- size = vsnprintf (NULL, 0, fmt, ap);
- va_end (ap);
-
- if (size < 0)
- return -1;
-
- va_copy (ap, va);
- str_ensure_space (self, size);
- size = vsnprintf (self->str + self->len, self->alloc - self->len, fmt, ap);
- va_end (ap);
-
- if (size > 0)
- self->len += size;
-
- return size;
-}
-
-static int
-str_append_printf (struct str *self, const char *fmt, ...)
- ATTRIBUTE_PRINTF (2, 3);
-
-static int
-str_append_printf (struct str *self, const char *fmt, ...)
-{
- va_list ap;
-
- va_start (ap, fmt);
- int size = str_append_vprintf (self, fmt, ap);
- va_end (ap);
- return size;
-}
-
-static void
-str_remove_slice (struct str *self, size_t start, size_t length)
-{
- size_t end = start + length;
- hard_assert (end <= self->len);
- memmove (self->str + start, self->str + end, self->len - end);
- self->str[self->len -= length] = '\0';
-
- // Shrink the string if the allocation becomes way too large
- if (self->alloc >= STR_SHRINK_THRESHOLD && self->len < (self->alloc >> 2))
- self->str = xrealloc (self->str, self->alloc >>= 2);
-}
-
-// --- Errors ------------------------------------------------------------------
-
-// Error reporting utilities. Inspired by GError, only much simpler.
-
-struct error
-{
- char *message; ///< Textual description of the event
-};
-
-static void
-error_set (struct error **e, const char *message, ...) ATTRIBUTE_PRINTF (2, 3);
-
-static void
-error_set (struct error **e, const char *message, ...)
-{
- if (!e)
- return;
-
- va_list ap;
- va_start (ap, message);
- int size = vsnprintf (NULL, 0, message, ap);
- va_end (ap);
-
- hard_assert (size >= 0);
-
- struct error *tmp = xmalloc (sizeof *tmp);
- tmp->message = xmalloc (size + 1);
-
- va_start (ap, message);
- size = vsnprintf (tmp->message, size + 1, message, ap);
- va_end (ap);
-
- hard_assert (size >= 0);
-
- soft_assert (*e == NULL);
- *e = tmp;
-}
-
-static void
-error_free (struct error *e)
-{
- free (e->message);
- free (e);
-}
-
-static void
-error_propagate (struct error **destination, struct error *source)
-{
- if (!destination)
- {
- error_free (source);
- return;
- }
-
- soft_assert (*destination == NULL);
- *destination = source;
-}
-
-// --- String hash map ---------------------------------------------------------
-
-// The most basic <string, managed pointer> map (or associative array).
-
-struct str_map_link
-{
- LIST_HEADER (str_map_link)
-
- void *data; ///< Payload
- size_t key_length; ///< Length of the key without '\0'
- char key[]; ///< The key for this link
-};
-
-struct str_map
-{
- struct str_map_link **map; ///< The hash table data itself
- size_t alloc; ///< Number of allocated entries
- size_t len; ///< Number of entries in the table
- void (*free) (void *); ///< Callback to destruct the payload
-
- /// Callback that transforms all key values for storage and comparison;
- /// has to behave exactly like strxfrm().
- size_t (*key_xfrm) (char *dest, const char *src, size_t n);
-};
-
-// As long as you don't remove the current entry, you can modify the map.
-// Use `link' directly to access the data.
-
-struct str_map_iter
-{
- struct str_map *map; ///< The map we're iterating
- size_t next_index; ///< Next table index to search
- struct str_map_link *link; ///< Current link
-};
-
-#define STR_MAP_MIN_ALLOC 16
-
-typedef void (*str_map_free_fn) (void *);
-
-static void
-str_map_init (struct str_map *self)
-{
- self->alloc = STR_MAP_MIN_ALLOC;
- self->len = 0;
- self->free = NULL;
- self->key_xfrm = NULL;
- self->map = xcalloc (self->alloc, sizeof *self->map);
-}
-
-static void
-str_map_free (struct str_map *self)
-{
- struct str_map_link **iter, **end = self->map + self->alloc;
- struct str_map_link *link, *tmp;
-
- for (iter = self->map; iter < end; iter++)
- for (link = *iter; link; link = tmp)
- {
- tmp = link->next;
- if (self->free)
- self->free (link->data);
- free (link);
- }
-
- free (self->map);
- self->map = NULL;
-}
-
-static void
-str_map_iter_init (struct str_map_iter *self, struct str_map *map)
-{
- self->map = map;
- self->next_index = 0;
- self->link = NULL;
-}
-
-static void *
-str_map_iter_next (struct str_map_iter *self)
-{
- struct str_map *map = self->map;
- if (self->link)
- self->link = self->link->next;
- while (!self->link)
- {
- if (self->next_index >= map->alloc)
- return NULL;
- self->link = map->map[self->next_index++];
- }
- return self->link->data;
-}
-
-static uint64_t
-str_map_hash (const char *s, size_t len)
-{
- static unsigned char key[16] = "SipHash 2-4 key!";
- return siphash (key, (const void *) s, len);
-}
-
-static uint64_t
-str_map_pos (struct str_map *self, const char *s)
-{
- size_t mask = self->alloc - 1;
- return str_map_hash (s, strlen (s)) & mask;
-}
-
-static uint64_t
-str_map_link_hash (struct str_map_link *self)
-{
- return str_map_hash (self->key, self->key_length);
-}
-
-static void
-str_map_resize (struct str_map *self, size_t new_size)
-{
- struct str_map_link **old_map = self->map;
- size_t i, old_size = self->alloc;
-
- // Only powers of two, so that we don't need to compute the modulo
- hard_assert ((new_size & (new_size - 1)) == 0);
- size_t mask = new_size - 1;
-
- self->alloc = new_size;
- self->map = xcalloc (self->alloc, sizeof *self->map);
- for (i = 0; i < old_size; i++)
- {
- struct str_map_link *iter = old_map[i], *next_iter;
- while (iter)
- {
- next_iter = iter->next;
- uint64_t pos = str_map_link_hash (iter) & mask;
- LIST_PREPEND (self->map[pos], iter);
- iter = next_iter;
- }
- }
-
- free (old_map);
-}
-
-static void
-str_map_set_real (struct str_map *self, const char *key, void *value)
-{
- uint64_t pos = str_map_pos (self, key);
- struct str_map_link *iter = self->map[pos];
- for (; iter; iter = iter->next)
- {
- if (strcmp (key, iter->key))
- continue;
-
- // Storing the same data doesn't destroy it
- if (self->free && value != iter->data)
- self->free (iter->data);
-
- if (value)
- {
- iter->data = value;
- return;
- }
-
- LIST_UNLINK (self->map[pos], iter);
- free (iter);
- self->len--;
-
- // The array should be at least 1/4 full
- if (self->alloc >= (STR_MAP_MIN_ALLOC << 2)
- && self->len < (self->alloc >> 2))
- str_map_resize (self, self->alloc >> 2);
- return;
- }
-
- if (!value)
- return;
-
- if (self->len >= self->alloc)
- {
- str_map_resize (self, self->alloc << 1);
- pos = str_map_pos (self, key);
- }
-
- // Link in a new element for the given <key, value> pair
- size_t key_length = strlen (key);
- struct str_map_link *link = xmalloc (sizeof *link + key_length + 1);
- link->data = value;
- link->key_length = key_length;
- memcpy (link->key, key, key_length + 1);
-
- LIST_PREPEND (self->map[pos], link);
- self->len++;
-}
-
-static void
-str_map_set (struct str_map *self, const char *key, void *value)
-{
- if (!self->key_xfrm)
- {
- str_map_set_real (self, key, value);
- return;
- }
- char tmp[self->key_xfrm (NULL, key, 0) + 1];
- self->key_xfrm (tmp, key, sizeof tmp);
- str_map_set_real (self, tmp, value);
-}
-
-static void *
-str_map_find_real (struct str_map *self, const char *key)
-{
- struct str_map_link *iter = self->map[str_map_pos (self, key)];
- for (; iter; iter = iter->next)
- if (!strcmp (key, (const char *) iter + sizeof *iter))
- return iter->data;
- return NULL;
-}
-
-static void *
-str_map_find (struct str_map *self, const char *key)
-{
- if (!self->key_xfrm)
- return str_map_find_real (self, key);
-
- char tmp[self->key_xfrm (NULL, key, 0) + 1];
- self->key_xfrm (tmp, key, sizeof tmp);
- return str_map_find_real (self, tmp);
-}
-
-// --- File descriptor utilities -----------------------------------------------
-
-static void
-set_cloexec (int fd)
-{
- soft_assert (fcntl (fd, F_SETFD, fcntl (fd, F_GETFD) | FD_CLOEXEC) != -1);
-}
-
-static bool
-set_blocking (int fd, bool blocking)
-{
- int flags = fcntl (fd, F_GETFL);
- hard_assert (flags != -1);
-
- bool prev = !(flags & O_NONBLOCK);
- if (blocking)
- flags &= ~O_NONBLOCK;
- else
- flags |= O_NONBLOCK;
-
- hard_assert (fcntl (fd, F_SETFL, flags) != -1);
- return prev;
-}
-
-static void
-xclose (int fd)
-{
- while (close (fd) == -1)
- if (!soft_assert (errno == EINTR))
- break;
-}
-
-// --- Event loop --------------------------------------------------------------
-
-// Basically the poor man's GMainLoop/libev/libuv. It might make some sense
-// to instead use those tested and proven libraries but we don't need much
-// and it's interesting to implement.
-
-// Actually it mustn't be totally shitty as scanning exercises it quite a bit.
-// We sacrifice some memory to allow for O(1) and O(log n) operations.
-
-typedef void (*poller_fd_fn) (const struct pollfd *, void *);
-typedef void (*poller_timer_fn) (void *);
-typedef void (*poller_idle_fn) (void *);
-
-#define POLLER_MIN_ALLOC 16
-
-struct poller_timer
-{
- struct poller_timers *timers; ///< The timers part of our poller
- ssize_t index; ///< Where we are in the array, or -1
-
- int64_t when; ///< When is the timer to expire
-
- poller_timer_fn dispatcher; ///< Event dispatcher
- void *user_data; ///< User data
-};
-
-struct poller_fd
-{
- struct poller *poller; ///< Our poller
- ssize_t index; ///< Where we are in the array, or -1
-
- int fd; ///< Our file descriptor
- short events; ///< The poll() events we registered for
- bool closed; ///< Whether fd has been closed already
-
- poller_fd_fn dispatcher; ///< Event dispatcher
- void *user_data; ///< User data
-};
-
-struct poller_idle
-{
- LIST_HEADER (poller_idle)
- struct poller *poller; ///< Our poller
-
- bool active; ///< Whether we're on the list
-
- poller_idle_fn dispatcher; ///< Event dispatcher
- void *user_data; ///< User data
-};
-
-// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-
-struct poller_timers
-{
- struct poller_timer **heap; ///< Min-heap of timers
- size_t len; ///< Number of scheduled timers
- size_t alloc; ///< Number of timers allocated
-};
-
-static void
-poller_timers_init (struct poller_timers *self)
-{
- self->alloc = POLLER_MIN_ALLOC;
- self->len = 0;
- self->heap = xmalloc (self->alloc * sizeof *self->heap);
-}
-
-static void
-poller_timers_free (struct poller_timers *self)
-{
- free (self->heap);
-}
-
-static int64_t
-poller_timers_get_current_time (void)
-{
-#ifdef _POSIX_TIMERS
- struct timespec tp;
- hard_assert (clock_gettime (CLOCK_BEST, &tp) != -1);
- return (int64_t) tp.tv_sec * 1000 + (int64_t) tp.tv_nsec / 1000000;
-#else
- struct timeval tp;
- gettimeofday (&tp, NULL);
- return (int64_t) tp.tv_sec * 1000 + (int64_t) tp.tv_usec / 1000;
-#endif
-}
-
-static void
-poller_timers_heapify_down (struct poller_timers *self, size_t index)
-{
- typedef struct poller_timer *timer_t;
- timer_t *end = self->heap + self->len;
-
- while (true)
- {
- timer_t *parent = self->heap + index;
- timer_t *left = self->heap + 2 * index + 1;
- timer_t *right = self->heap + 2 * index + 2;
-
- timer_t *lowest = parent;
- if (left < end && (*left) ->when < (*lowest)->when)
- lowest = left;
- if (right < end && (*right)->when < (*lowest)->when)
- lowest = right;
- if (parent == lowest)
- break;
-
- timer_t tmp = *parent;
- *parent = *lowest;
- *lowest = tmp;
-
- (*parent)->index = parent - self->heap;
- (*lowest)->index = lowest - self->heap;
- index = lowest - self->heap;
- }
-}
-
-static void
-poller_timers_remove_at_index (struct poller_timers *self, size_t index)
-{
- hard_assert (index < self->len);
- self->heap[index]->index = -1;
- if (index == --self->len)
- return;
-
- self->heap[index] = self->heap[self->len];
- self->heap[index]->index = index;
- poller_timers_heapify_down (self, index);
-}
-
-static void
-poller_timers_dispatch (struct poller_timers *self)
-{
- int64_t now = poller_timers_get_current_time ();
- while (self->len && self->heap[0]->when <= now)
- {
- struct poller_timer *timer = self->heap[0];
- poller_timers_remove_at_index (self, 0);
- timer->dispatcher (timer->user_data);
- }
-}
-
-static void
-poller_timers_heapify_up (struct poller_timers *self, size_t index)
-{
- while (index != 0)
- {
- size_t parent = (index - 1) / 2;
- if (self->heap[parent]->when <= self->heap[index]->when)
- break;
-
- struct poller_timer *tmp = self->heap[parent];
- self->heap[parent] = self->heap[index];
- self->heap[index] = tmp;
-
- self->heap[parent]->index = parent;
- self->heap[index] ->index = index;
- index = parent;
- }
-}
-
-static void
-poller_timers_set (struct poller_timers *self, struct poller_timer *timer)
-{
- hard_assert (timer->timers == self);
- if (timer->index != -1)
- {
- poller_timers_heapify_down (self, timer->index);
- poller_timers_heapify_up (self, timer->index);
- return;
- }
-
- if (self->len == self->alloc)
- self->heap = xreallocarray (self->heap,
- self->alloc <<= 1, sizeof *self->heap);
- self->heap[self->len] = timer;
- timer->index = self->len;
- poller_timers_heapify_up (self, self->len++);
-}
-
-static int
-poller_timers_get_poll_timeout (struct poller_timers *self)
-{
- if (!self->len)
- return -1;
-
- int64_t timeout = self->heap[0]->when - poller_timers_get_current_time ();
- if (timeout <= 0)
- return 0;
- if (timeout > INT_MAX)
- return INT_MAX;
- return timeout;
-}
-
-// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-
-static void
-poller_idle_dispatch (struct poller_idle *list)
-{
- struct poller_idle *iter, *next;
- for (iter = list; iter; iter = next)
- {
- next = iter->next;
- iter->dispatcher (iter->user_data);
- }
-}
-
-// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-
-#ifdef __linux__
-#include <sys/epoll.h>
-
-struct poller
-{
- int epoll_fd; ///< The epoll FD
- struct poller_fd **fds; ///< Information associated with each FD
- int *dummy; ///< For poller_remove_from_dispatch()
- struct epoll_event *revents; ///< Output array for epoll_wait()
- size_t len; ///< Number of polled descriptors
- size_t alloc; ///< Number of entries allocated
-
- struct poller_timers timers; ///< Timeouts
- struct poller_idle *idle; ///< Idle events
-
- int revents_len; ///< Number of entries in `revents'
-};
-
-static void
-poller_init (struct poller *self)
-{
- self->epoll_fd = epoll_create (POLLER_MIN_ALLOC);
- hard_assert (self->epoll_fd != -1);
- set_cloexec (self->epoll_fd);
-
- self->len = 0;
- self->alloc = POLLER_MIN_ALLOC;
- self->fds = xcalloc (self->alloc, sizeof *self->fds);
- self->dummy = xcalloc (self->alloc, sizeof *self->dummy);
- self->revents = xcalloc (self->alloc, sizeof *self->revents);
- self->revents_len = 0;
-
- poller_timers_init (&self->timers);
- self->idle = NULL;
-}
-
-static void
-poller_free (struct poller *self)
-{
- for (size_t i = 0; i < self->len; i++)
- {
- struct poller_fd *fd = self->fds[i];
- hard_assert (epoll_ctl (self->epoll_fd,
- EPOLL_CTL_DEL, fd->fd, (void *) "") != -1);
- }
-
- poller_timers_free (&self->timers);
-
- xclose (self->epoll_fd);
- free (self->fds);
- free (self->dummy);
- free (self->revents);
-}
-
-static void
-poller_ensure_space (struct poller *self)
-{
- if (self->len < self->alloc)
- return;
-
- self->alloc <<= 1;
- hard_assert (self->alloc != 0);
-
- self->revents = xreallocarray
- (self->revents, sizeof *self->revents, self->alloc);
- self->fds = xreallocarray
- (self->fds, sizeof *self->fds, self->alloc);
- self->dummy = xreallocarray
- (self->dummy, sizeof *self->dummy, self->alloc);
-}
-
-static short
-poller_epoll_to_poll_events (uint32_t events)
-{
- short result = 0;
- if (events & EPOLLIN) result |= POLLIN;
- if (events & EPOLLOUT) result |= POLLOUT;
- if (events & EPOLLERR) result |= POLLERR;
- if (events & EPOLLHUP) result |= POLLHUP;
- if (events & EPOLLPRI) result |= POLLPRI;
- return result;
-}
-
-static uint32_t
-poller_poll_to_epoll_events (short events)
-{
- uint32_t result = 0;
- if (events & POLLIN) result |= EPOLLIN;
- if (events & POLLOUT) result |= EPOLLOUT;
- if (events & POLLERR) result |= EPOLLERR;
- if (events & POLLHUP) result |= EPOLLHUP;
- if (events & POLLPRI) result |= EPOLLPRI;
- return result;
-}
-
-static void
-poller_set (struct poller *self, struct poller_fd *fd)
-{
- hard_assert (fd->poller == self);
- bool modifying = true;
- if (fd->index == -1)
- {
- poller_ensure_space (self);
- self->fds[fd->index = self->len++] = fd;
- modifying = false;
- }
-
- struct epoll_event event;
- event.events = poller_poll_to_epoll_events (fd->events);
- event.data.ptr = fd;
- hard_assert (epoll_ctl (self->epoll_fd,
- modifying ? EPOLL_CTL_MOD : EPOLL_CTL_ADD, fd->fd, &event) != -1);
-}
-
-static int
-poller_compare_fds (const void *ax, const void *bx)
-{
- const struct epoll_event *ay = ax, *by = bx;
- struct poller_fd *a = ay->data.ptr, *b = by->data.ptr;
- return a->fd - b->fd;
-}
-
-static void
-poller_remove_from_dispatch (struct poller *self, const struct poller_fd *fd)
-{
- if (!self->revents_len)
- return;
-
- struct epoll_event key = { .data.ptr = (void *) fd }, *fd_event;
- if ((fd_event = bsearch (&key, self->revents,
- self->revents_len, sizeof *self->revents, poller_compare_fds)))
- {
- fd_event->events = -1;
-
- // Don't let any further bsearch()'s touch possibly freed memory
- int *dummy = self->dummy + (fd_event - self->revents);
- *dummy = fd->fd;
- fd_event->data.ptr =
- (uint8_t *) dummy - offsetof (struct poller_fd, fd);
- }
-}
-
-static void
-poller_remove_at_index (struct poller *self, size_t index)
-{
- hard_assert (index < self->len);
- struct poller_fd *fd = self->fds[index];
- fd->index = -1;
-
- poller_remove_from_dispatch (self, fd);
- if (!fd->closed)
- hard_assert (epoll_ctl (self->epoll_fd,
- EPOLL_CTL_DEL, fd->fd, (void *) "") != -1);
-
- if (index != --self->len)
- {
- self->fds[index] = self->fds[self->len];
- self->fds[index]->index = index;
- }
-}
-
-static void
-poller_run (struct poller *self)
-{
- // Not reentrant
- hard_assert (!self->revents_len);
-
- int n_fds;
- do
- n_fds = epoll_wait (self->epoll_fd, self->revents, self->len,
- self->idle ? 0 : poller_timers_get_poll_timeout (&self->timers));
- while (n_fds == -1 && errno == EINTR);
-
- if (n_fds == -1)
- exit_fatal ("%s: %s", "epoll", strerror (errno));
-
- // Sort them by file descriptor number for binary search
- qsort (self->revents, n_fds, sizeof *self->revents, poller_compare_fds);
- self->revents_len = n_fds;
-
- poller_timers_dispatch (&self->timers);
- poller_idle_dispatch (self->idle);
-
- for (int i = 0; i < n_fds; i++)
- {
- struct epoll_event *revents = self->revents + i;
- if (revents->events == (uint32_t) -1)
- continue;
-
- struct poller_fd *fd = revents->data.ptr;
- hard_assert (fd->index != -1);
-
- struct pollfd pfd;
- pfd.fd = fd->fd;
- pfd.revents = poller_epoll_to_poll_events (revents->events);
- pfd.events = fd->events;
-
- fd->dispatcher (&pfd, fd->user_data);
- }
-
- self->revents_len = 0;
-}
-
-#else // !__linux__
-
-struct poller
-{
- struct pollfd *fds; ///< Polled descriptors
- struct poller_fd **fds_data; ///< Additional information for each FD
- size_t len; ///< Number of polled descriptors
- size_t alloc; ///< Number of entries allocated
-
- struct poller_timers timers; ///< Timers
- struct poller_idle *idle; ///< Idle events
- int dispatch_next; ///< The next dispatched FD or -1
-};
-
-static void
-poller_init (struct poller *self)
-{
- self->alloc = POLLER_MIN_ALLOC;
- self->len = 0;
- self->fds = xcalloc (self->alloc, sizeof *self->fds);
- self->fds_data = xcalloc (self->alloc, sizeof *self->fds_data);
- poller_timers_init (&self->timers);
- self->dispatch_next = -1;
-}
-
-static void
-poller_free (struct poller *self)
-{
- free (self->fds);
- free (self->fds_data);
- poller_timers_free (&self->timers);
-}
-
-static void
-poller_ensure_space (struct poller *self)
-{
- if (self->len < self->alloc)
- return;
-
- self->alloc <<= 1;
- self->fds = xreallocarray (self->fds, sizeof *self->fds, self->alloc);
- self->fds_data = xreallocarray
- (self->fds_data, sizeof *self->fds_data, self->alloc);
-}
-
-static void
-poller_set (struct poller *self, struct poller_fd *fd)
-{
- hard_assert (fd->poller == self);
- if (fd->index == -1)
- {
- poller_ensure_space (self);
- self->fds_data[fd->index = self->len++] = fd;
- }
-
- struct pollfd *new_entry = self->fds + fd->index;
- memset (new_entry, 0, sizeof *new_entry);
- new_entry->fd = fd->fd;
- new_entry->events = fd->events;
-}
-
-static void
-poller_remove_at_index (struct poller *self, size_t index)
-{
- hard_assert (index < self->len);
- struct poller_fd *fd = self->fds_data[index];
- fd->index = -1;
-
- if (index == --self->len)
- return;
-
- // Make sure that we don't disrupt the dispatch loop; kind of crude
- if ((int) index < self->dispatch_next)
- {
- memmove (self->fds + index, self->fds + index + 1,
- (self->len - index) * sizeof *self->fds);
- memmove (self->fds_data + index, self->fds_data + index + 1,
- (self->len - index) * sizeof *self->fds_data);
- for (size_t i = index; i < self->len; i++)
- self->fds_data[i]->index = i;
-
- self->dispatch_next--;
- }
- else
- {
- self->fds[index] = self->fds [self->len];
- self->fds_data[index] = self->fds_data[self->len];
- self->fds_data[index]->index = index;
- }
-}
-
-static void
-poller_run (struct poller *self)
-{
- // Not reentrant
- hard_assert (self->dispatch_next == -1);
-
- int result;
- do
- result = poll (self->fds, self->len,
- self->idle ? 0 : poller_timers_get_poll_timeout (&self->timers));
- while (result == -1 && errno == EINTR);
-
- if (result == -1)
- exit_fatal ("%s: %s", "poll", strerror (errno));
-
- poller_timers_dispatch (&self->timers);
- poller_idle_dispatch (self->idle);
-
- for (int i = 0; i < (int) self->len; )
- {
- struct pollfd pfd = self->fds[i];
- struct poller_fd *fd = self->fds_data[i];
- self->dispatch_next = ++i;
- if (pfd.revents)
- fd->dispatcher (&pfd, fd->user_data);
- i = self->dispatch_next;
- }
-
- self->dispatch_next = -1;
-}
-
-#endif // !__linux__
-
-// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-
-static void
-poller_timer_init (struct poller_timer *self, struct poller *poller)
-{
- memset (self, 0, sizeof *self);
- self->timers = &poller->timers;
- self->index = -1;
-}
-
-static void
-poller_timer_set (struct poller_timer *self, int timeout_ms)
-{
- self->when = poller_timers_get_current_time () + timeout_ms;
- poller_timers_set (self->timers, self);
-}
-
-static void
-poller_timer_reset (struct poller_timer *self)
-{
- if (self->index != -1)
- poller_timers_remove_at_index (self->timers, self->index);
-}
-
-// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-
-static void
-poller_idle_init (struct poller_idle *self, struct poller *poller)
-{
- memset (self, 0, sizeof *self);
- self->poller = poller;
-}
-
-static void
-poller_idle_set (struct poller_idle *self)
-{
- if (self->active)
- return;
-
- LIST_PREPEND (self->poller->idle, self);
- self->active = true;
-}
-
-static void
-poller_idle_reset (struct poller_idle *self)
-{
- if (!self->active)
- return;
-
- LIST_UNLINK (self->poller->idle, self);
- self->prev = NULL;
- self->next = NULL;
- self->active = false;
-}
-
-// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-
-static void
-poller_fd_init (struct poller_fd *self, struct poller *poller, int fd)
-{
- memset (self, 0, sizeof *self);
- self->poller = poller;
- self->index = -1;
- self->fd = fd;
-}
-
-static void
-poller_fd_set (struct poller_fd *self, short events)
-{
- self->events = events;
- poller_set (self->poller, self);
-}
-
-static void
-poller_fd_reset (struct poller_fd *self)
-{
- if (self->index != -1)
- poller_remove_at_index (self->poller, self->index);
-}
-
-// --- Utilities ---------------------------------------------------------------
-
-static void
-split_str_ignore_empty (const char *s, char delimiter, struct str_vector *out)
-{
- const char *begin = s, *end;
-
- while ((end = strchr (begin, delimiter)))
- {
- if (begin != end)
- str_vector_add_owned (out, xstrndup (begin, end - begin));
- begin = ++end;
- }
-
- if (*begin)
- str_vector_add (out, begin);
-}
-
-static char *
-strip_str_in_place (char *s, const char *stripped_chars)
-{
- char *end = s + strlen (s);
- while (end > s && strchr (stripped_chars, end[-1]))
- *--end = '\0';
-
- char *start = s + strspn (s, stripped_chars);
- if (start > s)
- memmove (s, start, end - start + 1);
- return s;
-}
-
-static char *
-join_str_vector (const struct str_vector *v, char delimiter)
-{
- if (!v->len)
- return xstrdup ("");
-
- struct str result;
- str_init (&result);
- str_append (&result, v->vector[0]);
- for (size_t i = 1; i < v->len; i++)
- str_append_printf (&result, "%c%s", delimiter, v->vector[i]);
- return str_steal (&result);
-}
-
-static char *xstrdup_printf (const char *, ...) ATTRIBUTE_PRINTF (1, 2);
-
-static char *
-xstrdup_printf (const char *format, ...)
-{
- va_list ap;
- struct str tmp;
- str_init (&tmp);
- va_start (ap, format);
- str_append_vprintf (&tmp, format, ap);
- va_end (ap);
- return str_steal (&tmp);
-}
-
-static bool
-str_append_env_path (struct str *output, const char *var, bool only_absolute)
-{
- const char *value = getenv (var);
-
- if (!value || (only_absolute && *value != '/'))
- return false;
-
- str_append (output, value);
- return true;
-}
-
-static void
-get_xdg_home_dir (struct str *output, const char *var, const char *def)
-{
- str_reset (output);
- if (!str_append_env_path (output, var, true))
- {
- str_append_env_path (output, "HOME", false);
- str_append_c (output, '/');
- str_append (output, def);
- }
-}
-
-static void
-get_xdg_config_dirs (struct str_vector *out)
-{
- struct str config_home;
- str_init (&config_home);
- get_xdg_home_dir (&config_home, "XDG_CONFIG_HOME", ".config");
- str_vector_add (out, config_home.str);
- str_free (&config_home);
-
- const char *xdg_config_dirs;
- if ((xdg_config_dirs = getenv ("XDG_CONFIG_DIRS")))
- split_str_ignore_empty (xdg_config_dirs, ':', out);
-}
-
-static char *
-resolve_config_filename (const char *filename)
-{
- // Absolute path is absolute
- if (*filename == '/')
- return xstrdup (filename);
-
- struct str_vector paths;
- str_vector_init (&paths);
- get_xdg_config_dirs (&paths);
-
- struct str file;
- str_init (&file);
-
- char *result = NULL;
- for (unsigned i = 0; i < paths.len; i++)
- {
- // As per spec, relative paths are ignored
- if (*paths.vector[i] != '/')
- continue;
-
- str_reset (&file);
- str_append_printf (&file, "%s/" PROGRAM_NAME "/%s",
- paths.vector[i], filename);
-
- struct stat st;
- if (!stat (file.str, &st))
- {
- result = str_steal (&file);
- break;
- }
- }
-
- str_vector_free (&paths);
- str_free (&file);
- return result;
-}
-
-static bool
-ensure_directory_existence (const char *path, struct error **e)
-{
- struct stat st;
-
- if (stat (path, &st))
- {
- if (mkdir (path, S_IRWXU | S_IRWXG | S_IRWXO))
- {
- error_set (e, "cannot create directory `%s': %s",
- path, strerror (errno));
- return false;
- }
- }
- else if (!S_ISDIR (st.st_mode))
- {
- error_set (e, "cannot create directory `%s': %s",
- path, "file exists but is not a directory");
- return false;
- }
- return true;
-}
-
-static bool
-mkdir_with_parents (char *path, struct error **e)
-{
- char *p = path;
-
- // XXX: This is prone to the TOCTTOU problem. The solution would be to
- // rewrite the function using the {mkdir,fstat}at() functions from
- // POSIX.1-2008, ideally returning a file descriptor to the open
- // directory, with the current code as a fallback. Or to use chdir().
- while ((p = strchr (p + 1, '/')))
- {
- *p = '\0';
- bool success = ensure_directory_existence (path, e);
- *p = '/';
-
- if (!success)
- return false;
- }
-
- return ensure_directory_existence (path, e);
-}
-
-static bool
-set_boolean_if_valid (bool *out, const char *s)
-{
- if (!strcasecmp (s, "yes")) *out = true;
- else if (!strcasecmp (s, "no")) *out = false;
- else if (!strcasecmp (s, "on")) *out = true;
- else if (!strcasecmp (s, "off")) *out = false;
- else if (!strcasecmp (s, "true")) *out = true;
- else if (!strcasecmp (s, "false")) *out = false;
- else return false;
-
- return true;
-}
-
-static bool
-xstrtoul (unsigned long *out, const char *s, int base)
-{
- char *end;
- errno = 0;
- *out = strtoul (s, &end, base);
- return errno == 0 && !*end && end != s;
-}
-
-static bool
-read_line (FILE *fp, struct str *s)
-{
- int c;
- bool at_end = true;
-
- str_reset (s);
- while ((c = fgetc (fp)) != EOF)
- {
- at_end = false;
- if (c == '\r')
- continue;
- if (c == '\n')
- break;
- str_append_c (s, c);
- }
-
- return !at_end;
-}
-
-#define XSSL_ERROR_TRY_AGAIN INT_MAX
-
-/// A small wrapper around SSL_get_error() to simplify further handling
-static int
-xssl_get_error (SSL *ssl, int result, const char **error_info)
-{
- int error = SSL_get_error (ssl, result);
- switch (error)
- {
- case SSL_ERROR_NONE:
- case SSL_ERROR_ZERO_RETURN:
- case SSL_ERROR_WANT_READ:
- case SSL_ERROR_WANT_WRITE:
- return error;
- case SSL_ERROR_SYSCALL:
- if ((error = ERR_get_error ()))
- *error_info = ERR_error_string (error, NULL);
- else if (result == 0)
- // An EOF that's not according to the protocol is still an EOF
- return SSL_ERROR_ZERO_RETURN;
- else
- {
- if (errno == EINTR)
- return XSSL_ERROR_TRY_AGAIN;
- *error_info = strerror (errno);
- }
- return SSL_ERROR_SSL;
- default:
- if ((error = ERR_get_error ()))
- *error_info = ERR_error_string (error, NULL);
- else
- *error_info = "Unknown error";
- return SSL_ERROR_SSL;
- }
-}
-
-static char *
-format_host_port_pair (const char *host, const char *port)
-{
- if (!host)
- host = "";
- // IPv6 addresses mess with the "colon notation"; let's go with RFC 2732
- if (strchr (host, ':'))
- return xstrdup_printf ("[%s]:%s", host, port);
- return xstrdup_printf ("%s:%s", host, port);
-}
-
-// --- Regular expressions -----------------------------------------------------
-
-static regex_t *
-regex_compile (const char *regex, int flags, struct error **e)
-{
- regex_t *re = xmalloc (sizeof *re);
- int err = regcomp (re, regex, flags);
- if (!err)
- return re;
-
- char buf[regerror (err, re, NULL, 0)];
- regerror (err, re, buf, sizeof buf);
-
- free (re);
- error_set (e, "%s: %s", "failed to compile regular expression", buf);
- return NULL;
-}
-
-static void
-regex_free (void *regex)
-{
- regfree (regex);
- free (regex);
-}
-
-// The cost of hashing a string is likely to be significantly smaller than that
-// of compiling the whole regular expression anew, so here is a simple cache.
-// Adding basic support for subgroups is easy: check `re_nsub' and output into
-// a `struct str_vector' (if all we want is the substrings).
-
-static void
-regex_cache_init (struct str_map *cache)
-{
- str_map_init (cache);
- cache->free = regex_free;
-}
-
-static bool
-regex_cache_match (struct str_map *cache, const char *regex, int flags,
- const char *s, struct error **e)
-{
- regex_t *re = str_map_find (cache, regex);
- if (!re)
- {
- re = regex_compile (regex, flags, e);
- if (!re)
- return false;
- str_map_set (cache, regex, re);
- }
- return regexec (re, s, 0, NULL, 0) != REG_NOMATCH;
-}
-
// --- IRC utilities -----------------------------------------------------------
struct irc_message
@@ -1920,315 +218,3 @@ irc_fnmatch (const char *pattern, const char *string)
irc_strxfrm (x_string, string, string_size);
return fnmatch (x_pattern, x_string, 0);
}
-
-// --- Configuration -----------------------------------------------------------
-
-// The keys are stripped of surrounding whitespace, the values are not.
-
-struct config_item
-{
- const char *key;
- const char *default_value;
- const char *description;
-};
-
-static void
-load_config_defaults (struct str_map *config, const struct config_item *table)
-{
- for (; table->key != NULL; table++)
- if (table->default_value)
- str_map_set (config, table->key, xstrdup (table->default_value));
- else
- str_map_set (config, table->key, NULL);
-}
-
-static bool
-read_config_file (struct str_map *config, struct error **e)
-{
- char *filename = resolve_config_filename (PROGRAM_NAME ".conf");
- if (!filename)
- return true;
-
- FILE *fp = fopen (filename, "r");
- if (!fp)
- {
- error_set (e, "could not open `%s' for reading: %s",
- filename, strerror (errno));
- free (filename);
- return false;
- }
-
- struct str line;
- str_init (&line);
-
- bool errors = false;
- for (unsigned line_no = 1; read_line (fp, &line); line_no++)
- {
- char *start = line.str;
- if (*start == '#')
- continue;
-
- while (isspace (*start))
- start++;
-
- char *end = strchr (start, '=');
- if (end)
- {
- char *value = end + 1;
- do
- *end = '\0';
- while (isspace (*--end));
-
- str_map_set (config, start, xstrdup (value));
- }
- else if (*start)
- {
- error_set (e, "line %u in config: %s", line_no, "malformed input");
- errors = true;
- break;
- }
- }
-
- str_free (&line);
- fclose (fp);
- free (filename);
- return !errors;
-}
-
-static char *
-write_default_config (const char *filename, const char *prolog,
- const struct config_item *table, struct error **e)
-{
- struct str path, base;
-
- str_init (&path);
- str_init (&base);
-
- if (filename)
- {
- char *tmp = xstrdup (filename);
- str_append (&path, dirname (tmp));
- strcpy (tmp, filename);
- str_append (&base, basename (tmp));
- free (tmp);
- }
- else
- {
- get_xdg_home_dir (&path, "XDG_CONFIG_HOME", ".config");
- str_append (&path, "/" PROGRAM_NAME);
- str_append (&base, PROGRAM_NAME ".conf");
- }
-
- if (!mkdir_with_parents (path.str, e))
- goto error;
-
- str_append_c (&path, '/');
- str_append_str (&path, &base);
-
- FILE *fp = fopen (path.str, "w");
- if (!fp)
- {
- error_set (e, "could not open `%s' for writing: %s",
- path.str, strerror (errno));
- goto error;
- }
-
- if (prolog)
- fputs (prolog, fp);
-
- errno = 0;
- for (; table->key != NULL; table++)
- {
- fprintf (fp, "# %s\n", table->description);
- if (table->default_value)
- fprintf (fp, "%s=%s\n", table->key, table->default_value);
- else
- fprintf (fp, "#%s=\n", table->key);
- }
- fclose (fp);
- if (errno)
- {
- error_set (e, "writing to `%s' failed: %s", path.str, strerror (errno));
- goto error;
- }
-
- str_free (&base);
- return str_steal (&path);
-
-error:
- str_free (&base);
- str_free (&path);
- return NULL;
-
-}
-
-static void
-call_write_default_config (const char *hint, const struct config_item *table)
-{
- static const char *prolog =
- "# " PROGRAM_NAME " " PROGRAM_VERSION " configuration file\n"
- "#\n"
- "# Relative paths are searched for in ${XDG_CONFIG_HOME:-~/.config}\n"
- "# /" PROGRAM_NAME " as well as in $XDG_CONFIG_DIRS/" PROGRAM_NAME "\n"
- "\n";
-
- struct error *e = NULL;
- char *filename = write_default_config (hint, prolog, table, &e);
- if (!filename)
- {
- print_error ("%s", e->message);
- error_free (e);
- exit (EXIT_FAILURE);
- }
- print_status ("configuration written to `%s'", filename);
- free (filename);
-}
-
-// --- Option handler ----------------------------------------------------------
-
-// Simple wrapper for the getopt_long API to make it easier to use and maintain.
-
-#define OPT_USAGE_ALIGNMENT_COLUMN 30 ///< Alignment for option descriptions
-
-enum
-{
- OPT_OPTIONAL_ARG = (1 << 0), ///< The argument is optional
- OPT_LONG_ONLY = (1 << 1) ///< Ignore the short name in opt_string
-};
-
-// All options need to have both a short name, and a long name. The short name
-// is what is returned from opt_handler_get(). It is possible to define a value
-// completely out of the character range combined with the OPT_LONG_ONLY flag.
-//
-// When `arg_hint' is defined, the option is assumed to have an argument.
-
-struct opt
-{
- int short_name; ///< The single-letter name
- const char *long_name; ///< The long name
- const char *arg_hint; ///< Option argument hint
- int flags; ///< Option flags
- const char *description; ///< Option description
-};
-
-struct opt_handler
-{
- int argc; ///< The number of program arguments
- char **argv; ///< Program arguments
-
- const char *arg_hint; ///< Program arguments hint
- const char *description; ///< Description of the program
-
- const struct opt *opts; ///< The list of options
- size_t opts_len; ///< The length of the option array
-
- struct option *options; ///< The list of options for getopt
- char *opt_string; ///< The `optstring' for getopt
-};
-
-static void
-opt_handler_free (struct opt_handler *self)
-{
- free (self->options);
- free (self->opt_string);
-}
-
-static void
-opt_handler_init (struct opt_handler *self, int argc, char **argv,
- const struct opt *opts, const char *arg_hint, const char *description)
-{
- memset (self, 0, sizeof *self);
- self->argc = argc;
- self->argv = argv;
- self->arg_hint = arg_hint;
- self->description = description;
-
- size_t len = 0;
- for (const struct opt *iter = opts; iter->long_name; iter++)
- len++;
-
- self->opts = opts;
- self->opts_len = len;
- self->options = xcalloc (len + 1, sizeof *self->options);
-
- struct str opt_string;
- str_init (&opt_string);
-
- for (size_t i = 0; i < len; i++)
- {
- const struct opt *opt = opts + i;
- struct option *mapped = self->options + i;
-
- mapped->name = opt->long_name;
- if (!opt->arg_hint)
- mapped->has_arg = no_argument;
- else if (opt->flags & OPT_OPTIONAL_ARG)
- mapped->has_arg = optional_argument;
- else
- mapped->has_arg = required_argument;
- mapped->val = opt->short_name;
-
- if (opt->flags & OPT_LONG_ONLY)
- continue;
-
- str_append_c (&opt_string, opt->short_name);
- if (opt->arg_hint)
- {
- str_append_c (&opt_string, ':');
- if (opt->flags & OPT_OPTIONAL_ARG)
- str_append_c (&opt_string, ':');
- }
- }
-
- self->opt_string = str_steal (&opt_string);
-}
-
-static void
-opt_handler_usage (struct opt_handler *self, FILE *stream)
-{
- struct str usage;
- str_init (&usage);
-
- str_append_printf (&usage, "Usage: %s [OPTION]... %s\n",
- self->argv[0], self->arg_hint ? self->arg_hint : "");
- str_append_printf (&usage, "%s\n\n", self->description);
-
- for (size_t i = 0; i < self->opts_len; i++)
- {
- struct str row;
- str_init (&row);
-
- const struct opt *opt = self->opts + i;
- if (!(opt->flags & OPT_LONG_ONLY))
- str_append_printf (&row, " -%c, ", opt->short_name);
- else
- str_append (&row, " ");
- str_append_printf (&row, "--%s", opt->long_name);
- if (opt->arg_hint)
- str_append_printf (&row, (opt->flags & OPT_OPTIONAL_ARG)
- ? " [%s]" : " %s", opt->arg_hint);
-
- // TODO: keep the indent if there are multiple lines
- if (row.len + 2 <= OPT_USAGE_ALIGNMENT_COLUMN)
- {
- str_append (&row, " ");
- str_append_printf (&usage, "%-*s%s\n",
- OPT_USAGE_ALIGNMENT_COLUMN, row.str, opt->description);
- }
- else
- str_append_printf (&usage, "%s\n%-*s%s\n", row.str,
- OPT_USAGE_ALIGNMENT_COLUMN, "", opt->description);
-
- str_free (&row);
- }
-
- fputs (usage.str, stream);
- str_free (&usage);
-}
-
-static int
-opt_handler_get (struct opt_handler *self)
-{
- return getopt_long (self->argc, self->argv,
- self->opt_string, self->options, NULL);
-}