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/* $OpenBSD: strerror_r.c,v 1.12 2015/10/25 10:22:09 bluhm Exp $ */
/* Public Domain <marc@snafu.org> */
#include <errno.h>
#include <limits.h>
#include <signal.h>
#include <string.h>
static size_t
__digits10(unsigned int num)
{
size_t i = 0;
do {
num /= 10;
i++;
} while (num != 0);
return i;
}
static int
__itoa(int num, int sign, char *buffer, size_t start, size_t end)
{
size_t pos;
unsigned int a;
int neg;
if (sign && num < 0) {
a = -num;
neg = 1;
}
else {
a = num;
neg = 0;
}
pos = start + __digits10(a);
if (neg)
pos++;
if (pos < end)
buffer[pos] = '\0';
else
return ERANGE;
pos--;
do {
buffer[pos] = (a % 10) + '0';
pos--;
a /= 10;
} while (a != 0);
if (neg)
buffer[pos] = '-';
return 0;
}
static int
__num2string(int num, int sign, int setid, char *buf, size_t buflen,
const char * const list[], size_t max, const char *def)
{
int ret = 0;
size_t len;
if (0 <= num && num < max) {
len = strlcpy(buf, list[num], buflen);
if (len >= buflen)
ret = ERANGE;
} else {
len = strlcpy(buf, def, buflen);
if (len >= buflen)
ret = ERANGE;
else {
ret = __itoa(num, sign, buf, len, buflen);
if (ret == 0)
ret = EINVAL;
}
}
return ret;
}
#define UPREFIX "Unknown error: "
int
strerror_r(int errnum, char *strerrbuf, size_t buflen)
{
int save_errno;
int ret_errno;
save_errno = errno;
ret_errno = __num2string(errnum, 1, 1, strerrbuf, buflen,
sys_errlist, sys_nerr, UPREFIX);
errno = ret_errno ? ret_errno : save_errno;
return (ret_errno);
}
DEF_WEAK(strerror_r);
#define USIGPREFIX "Unknown signal: "
char *
__strsignal(int num, char *buf)
{
__num2string(num, 0, 2, buf, NL_TEXTMAX, sys_siglist, NSIG,
USIGPREFIX);
return buf;
}
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