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dynamic array functions

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Originally committed as revision 1955 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Fabrice Bellard 2003-06-13 14:22:23 +00:00
parent 124ba5836f
commit 39f472c3b6
2 changed files with 31 additions and 0 deletions
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10
libavformat/avformat.h
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@ -428,6 +428,16 @@ int stristart(const char *str, const char *val, const char **ptr);
void pstrcpy(char *buf, int buf_size, const char *str); void pstrcpy(char *buf, int buf_size, const char *str);
char *pstrcat(char *buf, int buf_size, const char *s); char *pstrcat(char *buf, int buf_size, const char *s);
void __dynarray_add(unsigned long **tab_ptr, int *nb_ptr, unsigned long elem);
#define dynarray_add(tab, nb_ptr, elem)\
do {\
typeof(tab) _tab = (tab);\
typeof(elem) _elem = (elem);\
(void)sizeof(**_tab == _elem); /* check that types are compatible */\
__dynarray_add((unsigned long **)_tab, nb_ptr, (unsigned long)_elem);\
} while(0)
struct in_addr; struct in_addr;
int resolve_host(struct in_addr *sin_addr, const char *hostname); int resolve_host(struct in_addr *sin_addr, const char *hostname);

21
libavformat/cutils.c
View File

@ -108,3 +108,24 @@ char *pstrcat(char *buf, int buf_size, const char *s)
} }
#endif #endif
/* add one element to a dynamic array */
void __dynarray_add(unsigned long **tab_ptr, int *nb_ptr, unsigned long elem)
{
int nb, nb_alloc;
unsigned long *tab;
nb = *nb_ptr;
tab = *tab_ptr;
if ((nb & (nb - 1)) == 0) {
if (nb == 0)
nb_alloc = 1;
else
nb_alloc = nb * 2;
tab = av_realloc(tab, nb_alloc * sizeof(unsigned long));
*tab_ptr = tab;
}
tab[nb++] = elem;
*nb_ptr = nb;
}