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/* SPDX-License-Identifier: BSD-3-Clause */
#include <commonlib/bsd/string.h>
#include <ctype.h>
#include <stddef.h>
size_t strlen(const char *str)
{
const char *ptr = str;
while (*ptr++)
;
return ptr - str - 1;
}
size_t strnlen(const char *str, size_t maxlen)
{
const char *ptr = str;
const char *end = str + maxlen;
if (!maxlen)
return 0;
while (*ptr++) {
/* Make sure this checks for ==, not >=, because the calculation
for `end` may overflow in some edge cases. */
if (ptr == end)
return maxlen;
}
return ptr - str - 1;
}
char *strcat(char *dst, const char *src)
{
char *ptr = dst + strlen(dst);
while (*src)
*ptr++ = *src++;
*ptr = '\0';
return dst;
}
char *strncat(char *dst, const char *src, size_t n)
{
char *ptr = dst + strlen(dst);
/* Not using strncpy() because '\0' may not be appended. */
while (n-- > 0 && *src)
*ptr++ = *src++;
*ptr = '\0';
return dst;
}
unsigned int skip_atoi(char **ptr)
{
unsigned int result = 0;
char *str;
for (str = *ptr; isdigit(str[0]); str++)
result = result * 10 + (str[0] - '0');
*ptr = str;
return result;
}
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