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Add the rt_atoi function. #10974

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Add the rt_atoi function. #10974

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2 changes: 1 addition & 1 deletion include/klibc/kstring.h
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Original file line number Diff line number Diff line change
Expand Up @@ -31,7 +31,7 @@ char *rt_strncpy(char *dest, const char *src, size_t n);
int rt_strncmp(const char *cs, const char *ct, size_t count);
int rt_strcmp(const char *cs, const char *ct);
size_t rt_strlen(const char *src);

int rt_atoi(const char* s);
#ifdef __cplusplus
}
#endif
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17 changes: 17 additions & 0 deletions src/klibc/kstring.c
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Expand Up @@ -533,6 +533,23 @@ size_t rt_strnlen(const char *s, size_t maxlen)
#endif /* RT_KLIBC_USING_USER_STRNLEN */
RTM_EXPORT(rt_strnlen);

int rt_atoi(const char* s)
{
int n = 0, sign = 1;

if (*s == '-')
{
sign = -1;
s++;
}
else if (*s == '+')
s++;

while (*s >= '0' && *s <= '9') n = n * 10 + (*s++ - '0');

return sign * n;
}

#ifdef RT_USING_HEAP
/**
* @brief This function will duplicate a string.
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