164 lines
2.7 KiB
C
164 lines
2.7 KiB
C
/* $OpenBSD: strerror_r.c,v 1.6 2005/08/08 08:05:37 espie Exp $ */
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/* Public Domain <marc@snafu.org> */
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#define sys_siglist _sys_siglist
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#include <errno.h>
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#include <limits.h>
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#include <signal.h>
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#include <string.h>
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typedef struct {
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int code;
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const char* msg;
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} CodeString;
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static const char*
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__code_string_lookup( const CodeString* strings,
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int code )
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{
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int nn = 0;
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for (;;)
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{
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if (strings[nn].code == 0)
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break;
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if (strings[nn].code == code)
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return strings[nn].msg;
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nn++;
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}
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return NULL;
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}
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static const CodeString _sys_error_strings[] =
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{
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#define __BIONIC_ERRDEF(x,y,z) { y, z },
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#include <sys/_errdefs.h>
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{ 0, NULL }
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};
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static size_t
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__digits10(unsigned int num)
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{
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size_t i = 0;
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do {
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num /= 10;
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i++;
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} while (num != 0);
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return i;
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}
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static int
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__itoa(int num, int sign, char *buffer, size_t start, size_t end)
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{
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size_t pos;
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unsigned int a;
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int neg;
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if (sign && num < 0) {
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a = -num;
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neg = 1;
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}
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else {
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a = num;
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neg = 0;
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}
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pos = start + __digits10(a);
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if (neg)
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pos++;
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if (pos < end)
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buffer[pos] = '\0';
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else
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return ERANGE;
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pos--;
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do {
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buffer[pos] = (a % 10) + '0';
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pos--;
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a /= 10;
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} while (a != 0);
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if (neg)
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buffer[pos] = '-';
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return 0;
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}
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int
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strerror_r(int errnum, char *strerrbuf, size_t buflen)
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{
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int save_errno;
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int len, ret = 0;
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const char* msg;
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save_errno = errno;
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msg = __code_string_lookup( _sys_error_strings, errnum );
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if (msg != NULL) {
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len = strlcpy(strerrbuf, msg, buflen);
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if ((size_t)len >= buflen)
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ret = ERANGE;
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} else {
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len = strlcpy(strerrbuf, "Unknown error: ", buflen);
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if ((size_t)len >= buflen)
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ret = ERANGE;
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else {
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int ret = __itoa(errnum, 1, strerrbuf, len, buflen);
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if (ret == 0)
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ret = EINVAL;
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}
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}
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return ret;
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}
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#if 0
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static const CodeString _sys_signal_strings[] =
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{
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#define SIGDEF(x,y,z) { y, z },
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#include <sys/_sigdefs.h>
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};
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static int
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__num2string(int num, int sign, int setid, char *buf, size_t buflen,
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char * list[], size_t max, const char *def)
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{
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int ret = 0;
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size_t len;
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if (0 <= num && num < max) {
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len = strlcpy(buf, def, buflen);
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if (len >= buflen)
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ret = ERANGE;
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} else {
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len = strlcpy(buf, def, buflen);
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if (len >= buflen)
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ret = ERANGE;
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else {
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ret = __itoa(num, sign, buf, len, buflen);
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if (ret == 0)
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ret = EINVAL;
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}
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}
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return ret;
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}
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#define USIGPREFIX "Unknown signal: "
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char *
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__strsignal(int num, char *buf)
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{
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__num2string(num, 0, 2, buf, NL_TEXTMAX, (char **)sys_siglist, NSIG,
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USIGPREFIX);
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return buf;
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}
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#endif
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