1 /* $NetBSD: strchr.c,v 1.1.1.1 2009/12/13 16:57:25 kardel Exp $ */ 2 3 /* 4 SYNOPSIS 5 #include <string.h> 6 7 char *strchr(char const *s, int c); 8 9 char *strrchr(char const *s, int c); 10 11 DESCRIPTION 12 The strchr() function returns a pointer to the first occurrence of the 13 character c in the string s. 14 15 The strrchr() function returns a pointer to the last occurrence of the 16 character c in the string s. 17 18 Here "character" means "byte" - these functions do not work with wide 19 or multi-byte characters. 20 21 RETURN VALUE 22 The strchr() and strrchr() functions return a pointer to the matched 23 character or NULL if the character is not found. 24 25 CONFORMING TO 26 SVID 3, POSIX, BSD 4.3, ISO 9899 27 */ 28 29 char* 30 strchr( char const *s, int c) 31 { 32 do { 33 if ((unsigned)*s == (unsigned)c) 34 return s; 35 36 } while (*(++s) != NUL); 37 38 return NULL; 39 } 40 41 char* 42 strrchr( char const *s, int c) 43 { 44 char const *e = s + strlen(s); 45 46 for (;;) { 47 if (--e < s) 48 break; 49 50 if ((unsigned)*e == (unsigned)c) 51 return e; 52 } 53 return NULL; 54 } 55 56 /* 57 * Local Variables: 58 * mode: C 59 * c-file-style: "stroustrup" 60 * indent-tabs-mode: nil 61 * End: 62 * end of compat/strsignal.c */ 63