lavu/parseutils: add av_small_strptime()

Make internal small_strptime() function public, and use it in place of
strptime().
This allows to avoid a dependency on strptime() on systems which do not
support it.

In particular, fix trac ticket #992.

configure

@@ -1359,7 +1359,6 @@ HAVE_LIST="
     socklen_t
     soundcard_h
     strerror_r
-    strptime
     struct_addrinfo
     struct_group_source_req
     struct_ip_mreq_source
@@ -3423,7 +3422,6 @@ check_func_headers malloc.h _aligned_malloc     && enable aligned_malloc
 check_func  setrlimit
 check_func  snprintf
 check_func  strerror_r
-check_func  strptime
 check_func  sched_getaffinity
 check_func  sysconf
 check_func  sysctl

doc/APIchanges

@@ -15,6 +15,12 @@ libavutil:     2011-04-18
 
 API changes, most recent first:
 
+2012-09-01 - xxxxxxx - lavu 51.72.100 - parseutils.h
+  Add av_small_strptime() time parsing function.
+
+  Can be used as a stripped-down replacement for strptime(), on
+  systems which do not support it.
+
 2012-08-13 - xxxxxxx - lavfi 3.8.100 - avfilter.h
   Add avfilter_get_class() function, and priv_class field to AVFilter
   struct.

libavformat/utils.c

@@ -4478,20 +4478,14 @@ void ff_make_absolute_url(char *buf, int size, const char *base,
 
 int64_t ff_iso8601_to_unix_time(const char *datestr)
 {
-#if HAVE_STRPTIME
     struct tm time1 = {0}, time2 = {0};
     char *ret1, *ret2;
-    ret1 = strptime(datestr, "%Y - %m - %d %T", &time1);
+    ret1 = av_small_strptime(datestr, "%Y - %m - %d %H:%M:%S", &time1);
-    ret2 = strptime(datestr, "%Y - %m - %dT%T", &time2);
+    ret2 = av_small_strptime(datestr, "%Y - %m - %dT%H:%M:%S", &time2);
     if (ret2 && !ret1)
         return av_timegm(&time2);
     else
         return av_timegm(&time1);
-#else
-    av_log(NULL, AV_LOG_WARNING, "strptime() unavailable on this system, cannot convert "
-                                 "the date string.\n");
-    return 0;
-#endif
 }
 
 int avformat_query_codec(AVOutputFormat *ofmt, enum AVCodecID codec_id, int std_compliance)

libavformat/version.h

@@ -31,7 +31,7 @@
 
 #define LIBAVFORMAT_VERSION_MAJOR 54
 #define LIBAVFORMAT_VERSION_MINOR 25
-#define LIBAVFORMAT_VERSION_MICRO 104
+#define LIBAVFORMAT_VERSION_MICRO 105
 
 #define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
                                                LIBAVFORMAT_VERSION_MINOR, \

libavutil/parseutils.c

@@ -438,17 +438,7 @@ static int date_get_num(const char **pp,
     return val;
 }
 
-/**
+char *av_small_strptime(const char *p, const char *fmt, struct tm *dt)
- * Parse the input string p according to the format string fmt and
- * store its results in the structure dt.
- * This implementation supports only a subset of the formats supported
- * by the standard strptime().
- *
- * @return a pointer to the first character not processed in this
- * function call, or NULL in case the function fails to match all of
- * the fmt string and therefore an error occurred
- */
-static char *small_strptime(const char *p, const char *fmt, struct tm *dt)
 {
     int c, val;
 
@@ -558,7 +548,7 @@ int av_parse_time(int64_t *timeval, const char *timestr, int duration)
 
         /* parse the year-month-day part */
         for (i = 0; i < FF_ARRAY_ELEMS(date_fmt); i++) {
-            q = small_strptime(p, date_fmt[i], &dt);
+            q = av_small_strptime(p, date_fmt[i], &dt);
             if (q)
                 break;
         }
@@ -576,7 +566,7 @@ int av_parse_time(int64_t *timeval, const char *timestr, int duration)
 
         /* parse the hour-minute-second part */
         for (i = 0; i < FF_ARRAY_ELEMS(time_fmt); i++) {
-            q = small_strptime(p, time_fmt[i], &dt);
+            q = av_small_strptime(p, time_fmt[i], &dt);
             if (q)
                 break;
         }
@@ -587,7 +577,7 @@ int av_parse_time(int64_t *timeval, const char *timestr, int duration)
             ++p;
         }
         /* parse timestr as HH:MM:SS */
-        q = small_strptime(p, time_fmt[0], &dt);
+        q = av_small_strptime(p, time_fmt[0], &dt);
         if (!q) {
             /* parse timestr as S+ */
             dt.tm_sec = strtol(p, (void *)&q, 10);

libavutil/parseutils.h

@@ -132,6 +132,31 @@ int av_parse_color(uint8_t *rgba_color, const char *color_string, int slen,
  */
 int av_parse_time(int64_t *timeval, const char *timestr, int duration);
 
+/**
+ * Parse the input string p according to the format string fmt and
+ * store its results in the structure dt.
+ * This implementation supports only a subset of the formats supported
+ * by the standard strptime().
+ *
+ * In particular it actually supports the parameters:
+ * - %H: the hour as a decimal number, using a 24-hour clock, in the
+ * range '00' through '23'
+ * - %M: the minute as a decimal number, using a 24-hour clock, in the
+ * range '00' through '59'
+ * - %S: the second as a decimal number, using a 24-hour clock, in the
+ * range '00' through '59'
+ * - %Y: the year as a decimal number, using the Gregorian calendar
+ * - %m: the month as a decimal number, in the range '1' through '12'
+ * - %d: the day of the month as a decimal number, in the range '1'
+ * through '31'
+ * - %%: a literal '%'
+ *
+ * @return a pointer to the first character not processed in this
+ * function call, or NULL in case the function fails to match all of
+ * the fmt string and therefore an error occurred
+ */
+char *av_small_strptime(const char *p, const char *fmt, struct tm *dt);
+
 /**
  * Attempt to find a specific tag in a URL.
  *

libavutil/version.h

@@ -39,8 +39,8 @@
  */
 
 #define LIBAVUTIL_VERSION_MAJOR 51
-#define LIBAVUTIL_VERSION_MINOR 71
+#define LIBAVUTIL_VERSION_MINOR 72
-#define LIBAVUTIL_VERSION_MICRO 101
+#define LIBAVUTIL_VERSION_MICRO 100
 
 #define LIBAVUTIL_VERSION_INT   AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \
                                                LIBAVUTIL_VERSION_MINOR, \