mirror of https://git.ffmpeg.org/ffmpeg.git
132 lines
3.3 KiB
C
132 lines
3.3 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 library 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 of the License, or (at your option) any later version.
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*
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* This library 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 this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "avformat.h"
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#include <ctype.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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