1STRCHR(3) Linux Programmer's Manual STRCHR(3)
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6 strchr, strrchr, strchrnul - locate character in string
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9 #include <string.h>
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11 char *strchr(const char *s, int c);
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13 char *strrchr(const char *s, int c);
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15 #define _GNU_SOURCE /* See feature_test_macros(7) */
16 #include <string.h>
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18 char *strchrnul(const char *s, int c);
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21 The strchr() function returns a pointer to the first occurrence of the
22 character c in the string s.
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24 The strrchr() function returns a pointer to the last occurrence of the
25 character c in the string s.
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27 The strchrnul() function is like strchr() except that if c is not found
28 in s, then it returns a pointer to the null byte at the end of s,
29 rather than NULL.
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31 Here "character" means "byte"; these functions do not work with wide or
32 multibyte characters.
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35 The strchr() and strrchr() functions return a pointer to the matched
36 character or NULL if the character is not found. The terminating null
37 byte is considered part of the string, so that if c is specified as
38 '\0', these functions return a pointer to the terminator.
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40 The strchrnul() function returns a pointer to the matched character, or
41 a pointer to the null byte at the end of s (i.e., s+strlen(s)) if the
42 character is not found.
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45 strchrnul() first appeared in glibc in version 2.1.1.
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48 For an explanation of the terms used in this section, see at‐
49 tributes(7).
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51 ┌─────────────────────────────────┬───────────────┬─────────┐
52 │Interface │ Attribute │ Value │
53 ├─────────────────────────────────┼───────────────┼─────────┤
54 │strchr(), strrchr(), strchrnul() │ Thread safety │ MT-Safe │
55 └─────────────────────────────────┴───────────────┴─────────┘
57 strchr(), strrchr(): POSIX.1-2001, POSIX.1-2008, C89, C99, SVr4,
58 4.3BSD.
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60 strchrnul() is a GNU extension.
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63 index(3), memchr(3), rindex(3), string(3), strlen(3), strpbrk(3),
64 strsep(3), strspn(3), strstr(3), strtok(3), wcschr(3), wcsrchr(3)
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67 This page is part of release 5.10 of the Linux man-pages project. A
68 description of the project, information about reporting bugs, and the
69 latest version of this page, can be found at
70 https://www.kernel.org/doc/man-pages/.
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74GNU 2019-03-06 STRCHR(3)