simpler strptime - added os_support.[ch] - moved localtime_r to os_support.c

Originally committed as revision 2228 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 109 insertions, 0 deletions

diff --git a/libavformat/cutils.c b/libavformat/cutils.c
index 74d66e5618..c31e5b5c17 100644
--- a/libavformat/cutils.c
+++ b/libavformat/cutils.c
@@ -128,3 +128,112 @@ void __dynarray_add(unsigned long **tab_ptr, int *nb_ptr, unsigned long elem)
     *nb_ptr = nb;
 }
 
+time_t mktimegm(struct tm *tm)
+{
+    time_t t;
+
+    int y = tm->tm_year + 1900, m = tm->tm_mon + 1, d = tm->tm_mday;
+
+    if (m < 3) {
+        m += 12;
+        y--;
+    }
+
+    t = 86400 * 
+        (d + (153 * m - 457) / 5 + 365 * y + y / 4 - y / 100 + y / 400 - 719469);
+
+    t += 3600 * tm->tm_hour + 60 * tm->tm_min + tm->tm_sec;
+
+    return t;
+}
+
+/* get a positive number between n_min and n_max, for a maximum length
+   of len_max. Return -1 if error. */
+static int date_get_num(const char **pp,
+                        int n_min, int n_max, int len_max)
+{
+    int i, val, c;
+    const char *p;
+
+    p = *pp;
+    val = 0;
+    for(i = 0; i < len_max; i++) {
+        c = *p;
+        if (!isdigit(c))
+            break;
+        val = (val * 10) + c - '0';
+        p++;
+    }
+    /* no number read ? */
+    if (p == *pp)
+        return -1;
+    if (val < n_min || val > n_max)
+        return -1;
+    *pp = p;
+    return val;
+}
+
+/* small strptime for ffmpeg */
+const char *small_strptime(const char *p, const char *fmt, 
+                           struct tm *dt)
+{
+    int c, val;
+
+    for(;;) {
+        c = *fmt++;
+        if (c == '\0') {
+            return p;
+        } else if (c == '%') {
+            c = *fmt++;
+            switch(c) {
+            case 'H':
+                val = date_get_num(&p, 0, 23, 2);
+                if (val == -1)
+                    return NULL;
+                dt->tm_hour = val;
+                break;
+            case 'M':
+                val = date_get_num(&p, 0, 59, 2);
+                if (val == -1)
+                    return NULL;
+                dt->tm_min = val;
+                break;
+            case 'S':
+                val = date_get_num(&p, 0, 59, 2);
+                if (val == -1)
+                    return NULL;
+                dt->tm_sec = val;
+                break;
+            case 'Y':
+                val = date_get_num(&p, 0, 9999, 4);
+                if (val == -1)
+                    return NULL;
+                dt->tm_year = val - 1900;
+                break;
+            case 'm':
+                val = date_get_num(&p, 1, 12, 2);
+                if (val == -1)
+                    return NULL;
+                dt->tm_mon = val - 1;
+                break;
+            case 'd':
+                val = date_get_num(&p, 1, 31, 2);
+                if (val == -1)
+                    return NULL;
+                dt->tm_mday = val;
+                break;
+            case '%':
+                goto match;
+            default:
+                return NULL;
+            }
+        } else {
+        match:
+            if (c != *p)
+                return NULL;
+            p++;
+        }
+    }
+    return p;
+}
+