memchr - Online Linux Manual PageSection : 3
Updated : 2023-01-05
Source : Linux man-pages 6.03

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NAMEmemchr, memrchr, rawmemchr − scan memory for a character

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LIBRARYStandard C library (libc, −lc)

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SYNOPSIS#include <string.h>void *memchr(const void s[.n], int c, size_t n); void *memrchr(const void s[.n], int c, size_t n);[[deprecated]] void *rawmemchr(const void s[.n], int c);Feature Test Macro Requirements for glibc (see feature_test_macros(7)): memrchr(), rawmemchr(): _GNU_SOURCE

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DESCRIPTIONThe memchr() function scans the initial n bytes of the memory area pointed to by s for the first instance of c. Both c and the bytes of the memory area pointed to by s are interpreted as unsigned char. The memrchr() function is like the memchr() function, except that it searches backward from the end of the n bytes pointed to by s instead of forward from the beginning. The rawmemchr() function is similar to memchr(), but it assumes (i.e., the programmer knows for certain) that an instance of c lies somewhere in the memory area starting at the location pointed to by s. If an instance of c is not found, the behavior is undefined. Use either strlen(3) or memchr(3) instead.

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RETURN VALUEThe memchr() and memrchr() functions return a pointer to the matching byte or NULL if the character does not occur in the given memory area. The rawmemchr() function returns a pointer to the matching byte.

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VERSIONSrawmemchr() first appeared in glibc 2.1. memrchr() first appeared in glibc 2.2.

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ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7). InterfaceAttributeValue memchr(), memrchr(), rawmemchr() Thread safetyMT-Safe

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STANDARDSmemchr(): POSIX.1-2001, POSIX.1-2008, C99, SVr4, 4.3BSD. The memrchr() function is a GNU extension, available since glibc 2.1.91. The rawmemchr() function is a GNU extension, available since glibc 2.1.

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SEE ALSObstring(3), ffs(3), memmem(3), strchr(3), strpbrk(3), strrchr(3), strsep(3), strspn(3), strstr(3), wmemchr(3) 0

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