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Diffstat (limited to 'gnu/egcs/libiberty/memchr.c')
-rw-r--r-- | gnu/egcs/libiberty/memchr.c | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/gnu/egcs/libiberty/memchr.c b/gnu/egcs/libiberty/memchr.c new file mode 100644 index 00000000000..cce30039437 --- /dev/null +++ b/gnu/egcs/libiberty/memchr.c @@ -0,0 +1,60 @@ +/* +FUNCTION + <<memchr>>---find character in memory + +INDEX + memchr + +ANSI_SYNOPSIS + #include <string.h> + void *memchr(const void *<[src]>, int <[c]>, size_t <[length]>); + +TRAD_SYNOPSIS + #include <string.h> + void *memchr(<[src]>, <[c]>, <[length]>) + void *<[src]>; + void *<[c]>; + size_t <[length]>; + +DESCRIPTION + This function searches memory starting at <<*<[src]>>> for the + character <[c]>. The search only ends with the first + occurrence of <[c]>, or after <[length]> characters; in + particular, <<NULL>> does not terminate the search. + +RETURNS + If the character <[c]> is found within <[length]> characters + of <<*<[src]>>>, a pointer to the character is returned. If + <[c]> is not found, then <<NULL>> is returned. + +PORTABILITY +<<memchr>> requires no supporting OS subroutines. + +QUICKREF + memchr ansi pure + +*/ + +#include <ansidecl.h> +#ifdef __STDC__ +#include <stddef.h> +#else +#define size_t unsigned long +#endif + +PTR +memchr (src_void, c, length) + register const PTR src_void; + int c; + size_t length; +{ + const unsigned char *src = (const unsigned char *)src_void; + + while (--length >= 0) + { + if (*src == c) + return (PTR)src; + src++; + } + return NULL; +} |