61 lines
1.2 KiB
C
61 lines
1.2 KiB
C
/*
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SYNOPSIS
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#include <string.h>
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char *strchr(char const *s, int c);
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char *strrchr(char const *s, int c);
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DESCRIPTION
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The strchr() function returns a pointer to the first occurrence of the
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character c in the string s.
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The strrchr() function returns a pointer to the last occurrence of the
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character c in the string s.
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Here "character" means "byte" - these functions do not work with wide
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or multi-byte characters.
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RETURN VALUE
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The strchr() and strrchr() functions return a pointer to the matched
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character or NULL if the character is not found.
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CONFORMING TO
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SVID 3, POSIX, BSD 4.3, ISO 9899
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*/
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char*
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strchr( char const *s, int c)
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{
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do {
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if ((unsigned)*s == (unsigned)c)
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return s;
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} while (*(++s) != NUL);
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return NULL;
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}
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char*
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strrchr( char const *s, int c)
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{
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char const *e = s + strlen(s);
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for (;;) {
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if (--e < s)
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break;
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if ((unsigned)*e == (unsigned)c)
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return e;
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}
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return NULL;
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}
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/*
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* Local Variables:
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* mode: C
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* c-file-style: "stroustrup"
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* indent-tabs-mode: nil
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* End:
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* end of compat/strsignal.c */
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