diff options
Diffstat (limited to 'libavahi-core/util.c')
-rw-r--r-- | libavahi-core/util.c | 214 |
1 files changed, 214 insertions, 0 deletions
diff --git a/libavahi-core/util.c b/libavahi-core/util.c new file mode 100644 index 0000000..270a48f --- /dev/null +++ b/libavahi-core/util.c @@ -0,0 +1,214 @@ +#include <string.h> +#include <unistd.h> +#include <fcntl.h> +#include <errno.h> +#include <limits.h> +#include <stdio.h> + +#include "util.h" + +gchar *avahi_get_host_name(void) { +#ifdef HOST_NAME_MAX + char t[HOST_NAME_MAX]; +#else + char t[256]; +#endif + gethostname(t, sizeof(t)); + t[sizeof(t)-1] = 0; + return avahi_normalize_name(t); +} + +gchar *avahi_normalize_name(const gchar *s) { + size_t l; + g_assert(s); + + l = strlen(s); + + if (!l) + return g_strdup("."); + + if (s[l-1] == '.') + return g_strdup(s); + + return g_strdup_printf("%s.", s); +} + +gint avahi_timeval_compare(const GTimeVal *a, const GTimeVal *b) { + g_assert(a); + g_assert(b); + + if (a->tv_sec < b->tv_sec) + return -1; + + if (a->tv_sec > b->tv_sec) + return 1; + + if (a->tv_usec < b->tv_usec) + return -1; + + if (a->tv_usec > b->tv_usec) + return 1; + + return 0; +} + +glong avahi_timeval_diff(const GTimeVal *a, const GTimeVal *b) { + g_assert(a); + g_assert(b); + + if (avahi_timeval_compare(a, b) < 0) + return avahi_timeval_diff(b, a); + + return ((glong) a->tv_sec - b->tv_sec)*1000000 + a->tv_usec - b->tv_usec; +} + + +gint avahi_set_cloexec(gint fd) { + gint n; + + g_assert(fd >= 0); + + if ((n = fcntl(fd, F_GETFD)) < 0) + return -1; + + if (n & FD_CLOEXEC) + return 0; + + return fcntl(fd, F_SETFD, n|FD_CLOEXEC); +} + +gint avahi_set_nonblock(gint fd) { + gint n; + + g_assert(fd >= 0); + + if ((n = fcntl(fd, F_GETFL)) < 0) + return -1; + + if (n & O_NONBLOCK) + return 0; + + return fcntl(fd, F_SETFL, n|O_NONBLOCK); +} + +gint avahi_wait_for_write(gint fd) { + fd_set fds; + gint r; + + FD_ZERO(&fds); + FD_SET(fd, &fds); + + if ((r = select(fd+1, NULL, &fds, NULL, NULL)) < 0) { + g_message("select() failed: %s", strerror(errno)); + + return -1; + } + + g_assert(r > 0); + + return 0; +} + +GTimeVal *avahi_elapse_time(GTimeVal *tv, guint msec, guint jitter) { + g_assert(tv); + + g_get_current_time(tv); + + if (msec) + g_time_val_add(tv, msec*1000); + + if (jitter) + g_time_val_add(tv, g_random_int_range(0, jitter) * 1000); + + return tv; +} + +gint avahi_age(const GTimeVal *a) { + GTimeVal now; + + g_assert(a); + + g_get_current_time(&now); + + return avahi_timeval_diff(&now, a); +} + +gboolean avahi_domain_cmp(const gchar *a, const gchar *b) { + int escaped_a = 0, escaped_b = 0; + g_assert(a); + g_assert(b); + + for (;;) { + /* Check for escape characters "\" */ + if ((escaped_a = *a == '\\')) + a ++; + + if ((escaped_b = *b == '\\')) + b++; + + /* Check for string end */ + if (*a == 0 && *b == 0) + return 0; + + if (*a == 0 && !escaped_b && *b == '.' && *(b+1) == 0) + return 0; + + if (!escaped_a && *a == '.' && *(a+1) == 0 && *b == 0) + return 0; + + /* Compare characters */ + if (escaped_a == escaped_b && *a != *b) + return *a < *b ? -1 : 1; + + /* Next characters */ + a++; + b++; + + } +} + +gboolean avahi_domain_equal(const gchar *a, const gchar *b) { + return avahi_domain_cmp(a, b) == 0; +} + +guint avahi_domain_hash(const gchar *p) { + char t[256]; + strncpy(t, p, sizeof(t)-1); + t[sizeof(t)-1] = 0; + + return g_int_hash(t); +} + +void avahi_hexdump(gconstpointer p, guint size) { + const guint8 *c = p; + g_assert(p); + + printf("Dumping %u bytes from %p:\n", size, p); + + while (size > 0) { + guint i; + + for (i = 0; i < 16; i++) { + if (i < size) + printf("%02x ", c[i]); + else + printf(" "); + } + + for (i = 0; i < 16; i++) { + if (i < size) + printf("%c", c[i] >= 32 && c[i] < 127 ? c[i] : '.'); + else + printf(" "); + } + + printf("\n"); + + c += 16; + + if (size <= 16) + break; + + size -= 16; + } +} |