mirror of https://git.videolan.org/git/ffmpeg.git
276 lines
7.0 KiB
C
276 lines
7.0 KiB
C
/*
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* Various simple utilities for ffmpeg system
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* Copyright (c) 2000, 2001, 2002 Fabrice Bellard
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avformat.h"
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#if !defined(CONFIG_NOCUTILS)
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/**
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* Return TRUE if val is a prefix of str. If it returns TRUE, ptr is
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* set to the next character in 'str' after the prefix.
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*
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* @param str input string
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* @param val prefix to test
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* @param ptr updated after the prefix in str in there is a match
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* @return TRUE if there is a match
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*/
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int strstart(const char *str, const char *val, const char **ptr)
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{
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const char *p, *q;
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p = str;
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q = val;
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while (*q != '\0') {
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if (*p != *q)
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return 0;
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p++;
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q++;
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}
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if (ptr)
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*ptr = p;
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return 1;
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}
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/**
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* Return TRUE if val is a prefix of str (case independent). If it
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* returns TRUE, ptr is set to the next character in 'str' after the
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* prefix.
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*
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* @param str input string
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* @param val prefix to test
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* @param ptr updated after the prefix in str in there is a match
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* @return TRUE if there is a match */
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int stristart(const char *str, const char *val, const char **ptr)
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{
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const char *p, *q;
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p = str;
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q = val;
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while (*q != '\0') {
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if (toupper(*(const unsigned char *)p) != toupper(*(const unsigned char *)q))
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return 0;
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p++;
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q++;
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}
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if (ptr)
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*ptr = p;
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return 1;
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}
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/**
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* Copy the string str to buf. If str length is bigger than buf_size -
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* 1 then it is clamped to buf_size - 1.
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* NOTE: this function does what strncpy should have done to be
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* useful. NEVER use strncpy.
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*
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* @param buf destination buffer
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* @param buf_size size of destination buffer
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* @param str source string
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*/
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void pstrcpy(char *buf, int buf_size, const char *str)
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{
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int c;
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char *q = buf;
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if (buf_size <= 0)
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return;
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for(;;) {
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c = *str++;
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if (c == 0 || q >= buf + buf_size - 1)
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break;
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*q++ = c;
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}
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*q = '\0';
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}
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/* strcat and truncate. */
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char *pstrcat(char *buf, int buf_size, const char *s)
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{
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int len;
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len = strlen(buf);
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if (len < buf_size)
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pstrcpy(buf + len, buf_size - len, s);
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return buf;
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}
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#endif
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/* add one element to a dynamic array */
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void __dynarray_add(unsigned long **tab_ptr, int *nb_ptr, unsigned long elem)
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{
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int nb, nb_alloc;
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unsigned long *tab;
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nb = *nb_ptr;
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tab = *tab_ptr;
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if ((nb & (nb - 1)) == 0) {
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if (nb == 0)
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nb_alloc = 1;
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else
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nb_alloc = nb * 2;
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tab = av_realloc(tab, nb_alloc * sizeof(unsigned long));
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*tab_ptr = tab;
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}
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tab[nb++] = elem;
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*nb_ptr = nb;
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}
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time_t mktimegm(struct tm *tm)
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{
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time_t t;
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int y = tm->tm_year + 1900, m = tm->tm_mon + 1, d = tm->tm_mday;
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if (m < 3) {
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m += 12;
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y--;
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}
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t = 86400 *
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(d + (153 * m - 457) / 5 + 365 * y + y / 4 - y / 100 + y / 400 - 719469);
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t += 3600 * tm->tm_hour + 60 * tm->tm_min + tm->tm_sec;
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return t;
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}
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#define ISLEAP(y) (((y) % 4 == 0) && (((y) % 100) != 0 || ((y) % 400) == 0))
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#define LEAPS_COUNT(y) ((y)/4 - (y)/100 + (y)/400)
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/* this is our own gmtime_r. it differs from its POSIX counterpart in a
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couple of places, though. */
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struct tm *brktimegm(time_t secs, struct tm *tm)
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{
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int days, y, ny, m;
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int md[] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
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days = secs / 86400;
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secs %= 86400;
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tm->tm_hour = secs / 3600;
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tm->tm_min = (secs % 3600) / 60;
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tm->tm_sec = secs % 60;
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/* oh well, may be someone some day will invent a formula for this stuff */
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y = 1970; /* start "guessing" */
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while (days >= (ISLEAP(y)?366:365)) {
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ny = (y + days/366);
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days -= (ny - y) * 365 + LEAPS_COUNT(ny - 1) - LEAPS_COUNT(y - 1);
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y = ny;
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}
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md[1] = ISLEAP(y)?29:28;
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for (m=0; days >= md[m]; m++)
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days -= md[m];
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tm->tm_year = y; /* unlike gmtime_r we store complete year here */
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tm->tm_mon = m+1; /* unlike gmtime_r tm_mon is from 1 to 12 */
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tm->tm_mday = days+1;
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return tm;
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}
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/* get a positive number between n_min and n_max, for a maximum length
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of len_max. Return -1 if error. */
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static int date_get_num(const char **pp,
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int n_min, int n_max, int len_max)
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{
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int i, val, c;
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const char *p;
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p = *pp;
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val = 0;
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for(i = 0; i < len_max; i++) {
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c = *p;
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if (!isdigit(c))
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break;
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val = (val * 10) + c - '0';
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p++;
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}
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/* no number read ? */
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if (p == *pp)
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return -1;
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if (val < n_min || val > n_max)
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return -1;
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*pp = p;
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return val;
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}
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/* small strptime for ffmpeg */
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const char *small_strptime(const char *p, const char *fmt,
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struct tm *dt)
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{
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int c, val;
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for(;;) {
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c = *fmt++;
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if (c == '\0') {
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return p;
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} else if (c == '%') {
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c = *fmt++;
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switch(c) {
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case 'H':
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val = date_get_num(&p, 0, 23, 2);
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if (val == -1)
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return NULL;
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dt->tm_hour = val;
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break;
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case 'M':
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val = date_get_num(&p, 0, 59, 2);
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if (val == -1)
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return NULL;
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dt->tm_min = val;
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break;
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case 'S':
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val = date_get_num(&p, 0, 59, 2);
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if (val == -1)
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return NULL;
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dt->tm_sec = val;
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break;
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case 'Y':
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val = date_get_num(&p, 0, 9999, 4);
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if (val == -1)
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return NULL;
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dt->tm_year = val - 1900;
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break;
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case 'm':
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val = date_get_num(&p, 1, 12, 2);
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if (val == -1)
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return NULL;
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dt->tm_mon = val - 1;
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break;
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case 'd':
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val = date_get_num(&p, 1, 31, 2);
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if (val == -1)
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return NULL;
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dt->tm_mday = val;
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break;
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case '%':
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goto match;
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default:
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return NULL;
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}
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} else {
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match:
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if (c != *p)
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return NULL;
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p++;
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}
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}
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return p;
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}
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