IABSD.fr/src/lib/libc/string/strerror_r.c

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• Author : bluhm
  Date : 2016-10-19 16:26:16
  Hash : 3a9dd5c3
  Message : Remove the save_errno dance inside strerror_r(3). It is from the time when we had national language support. OK millert@

• lib/libc/string/strerror_r.c

• /* $OpenBSD: strerror_r.c,v 1.13 2016/10/19 16:26:16 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 ret_errno;
  
  	ret_errno = __num2string(errnum, 1, 1, strerrbuf, buflen,
  	    sys_errlist, sys_nerr, UPREFIX);
  
  	if (ret_errno)
  		errno = ret_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;
  }