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string.h: Add toupper()/tolower()

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Signed-off-by: Hector Martin <marcan@marcan.st>
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Hector Martin 2021-10-18 18:17:15 +09:00
parent ef83f62d0e
commit e763faa3c1
1 changed files with 16 additions and 0 deletions
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16
sysinc/string.h
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@ -19,4 +19,20 @@ size_t strnlen(const char *s, size_t n);
char *strchr(const char *s, int c);
char *strrchr(const char *s, int c);
static inline int tolower(int c)
{
if (c >= 'A' && c <= 'Z')
return c - 'A' + 'a';
else
return c;
}
static inline int toupper(int c)
{
if (c >= 'a' && c <= 'z')
return c - 'a' + 'A';
else
return c;
}
#endif