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STRSTR.C
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C/C++ Source or Header
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1993-07-29
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668b
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29 lines
/* from Henry Spencer's stringlib */
#include <string.h>
/*
* strstr - find first occurrence of wanted in s
*/
char * /* found string, or NULL if none */
strstr(s, wanted)
const char *s;
const char *wanted;
{
register const char *scan;
register size_t len;
register char firstc;
/*
* The odd placement of the two tests is so "" is findable.
* Also, we inline the first char for speed.
* The ++ on scan has been moved down for optimization.
*/
firstc = *wanted;
len = strlen(wanted);
for (scan = s; *scan != firstc || strncmp(scan, wanted, len) != 0; )
if (*scan++ == '\0')
return(NULL);
return((char *)scan);
}