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/*
* Find a character in a string, unless it's a colon contained within
* square brackets. Used for untangling strings of the form
* 'host:port', where host can be an IPv6 literal.
*
* This internal function provides an API that's a bit like strchr (in
* that it returns a pointer to the character it found, or NULL), and
* a bit like strcspn (in that you can give it a set of characters to
* look for, not just one). Also it has an option to return the first
* or last character it finds. Other functions in the utils directory
* provide wrappers on it with APIs more like familiar <string.h>
* functions.
*/
#include <stdbool.h>
#include <string.h>
#include "defs.h"
#include "misc.h"
#include "utils/utils.h"
const char *host_strchr_internal(const char *s, const char *set, bool first)
{
int brackets = 0;
const char *ret = NULL;
while (1) {
if (!*s)
return ret;
if (*s == '[')
brackets++;
else if (*s == ']' && brackets > 0)
brackets--;
else if (brackets && *s == ':')
/* never match */ ;
else if (strchr(set, *s)) {
ret = s;
if (first)
return ret;
}
s++;
}
}
#ifdef TEST
int main(void)
{
int passes = 0, fails = 0;
#define TEST1(func, string, arg2, suffix, result) do \
{ \
const char *str = string; \
unsigned ret = func(str, arg2) suffix; \
if (ret == result) { \
passes++; \
} else { \
printf("fail: %s(%s,%s)%s = %u, expected %u\n", \
#func, #string, #arg2, #suffix, ret, \
(unsigned)result); \
fails++; \
} \
} while (0)
TEST1(host_strchr, "[1:2:3]:4:5", ':', -str, 7);
TEST1(host_strrchr, "[1:2:3]:4:5", ':', -str, 9);
TEST1(host_strcspn, "[1:2:3]:4:5", "/:",, 7);
TEST1(host_strchr, "[1:2:3]", ':', == NULL, 1);
TEST1(host_strrchr, "[1:2:3]", ':', == NULL, 1);
TEST1(host_strcspn, "[1:2:3]", "/:",, 7);
TEST1(host_strcspn, "[1:2/3]", "/:",, 4);
TEST1(host_strcspn, "[1:2:3]/", "/:",, 7);
printf("passed %d failed %d total %d\n", passes, fails, passes+fails);
return fails != 0 ? 1 : 0;
}
#endif /* TEST */
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