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string: Add strcspn()

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Add an implementation of strcspn() which returns the number of initial
characters that do not match any in a rejection list.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass
2017-05-18 20:09:29 -06:00
parent 6b45ba45fb
commit a7d0021063
2 changed files with 39 additions and 0 deletions
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15
include/linux/string.h
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@ -76,6 +76,21 @@ extern __kernel_size_t strlen(const char *);
#ifndef __HAVE_ARCH_STRNLEN
extern __kernel_size_t strnlen(const char *,__kernel_size_t);
#endif
#ifndef __HAVE_ARCH_STRCSPN
/**
* strcspn() - find span of string without given characters
*
* Calculates the length of the initial segment of @s which consists entirely
* of bsytes not in reject.
*
* @s: string to search
* @reject: strings which cause the search to halt
* @return number of characters at the start of @s which are not in @reject
*/
size_t strcspn(const char *s, const char *reject);
#endif
#ifndef __HAVE_ARCH_STRDUP
extern char * strdup(const char *);
#endif