Annotation of prex/usr/lib/libc/string/strerror.c, Revision 1.1
1.1 ! nbrk 1: /*
! 2: * Copyright (c) 1988, 1993
! 3: * The Regents of the University of California. All rights reserved.
! 4: *
! 5: * Redistribution and use in source and binary forms, with or without
! 6: * modification, are permitted provided that the following conditions
! 7: * are met:
! 8: * 1. Redistributions of source code must retain the above copyright
! 9: * notice, this list of conditions and the following disclaimer.
! 10: * 2. Redistributions in binary form must reproduce the above copyright
! 11: * notice, this list of conditions and the following disclaimer in the
! 12: * documentation and/or other materials provided with the distribution.
! 13: * 3. Neither the name of the University nor the names of its contributors
! 14: * may be used to endorse or promote products derived from this software
! 15: * without specific prior written permission.
! 16: *
! 17: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 18: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 19: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 20: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 21: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 22: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 23: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 24: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 25: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 26: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 27: * SUCH DAMAGE.
! 28: */
! 29:
! 30: #include <string.h>
! 31:
! 32: char *
! 33: strerror(num)
! 34: int num;
! 35: {
! 36: extern const int sys_nerr;
! 37: extern const char *sys_errlist[];
! 38: #define UPREFIX "Unknown error: "
! 39: static char ebuf[40] = UPREFIX; /* 64-bit number + slop */
! 40: unsigned int errnum;
! 41: char *p, *t;
! 42: char tmp[40];
! 43:
! 44: errnum = num; /* convert to unsigned */
! 45: if (errnum < (unsigned int)sys_nerr)
! 46: return((char *)sys_errlist[errnum]);
! 47:
! 48: /* Do this by hand, so we don't include stdio(3). */
! 49: t = tmp;
! 50: do {
! 51: *t++ = "0123456789"[errnum % 10];
! 52: } while (errnum /= 10);
! 53: for (p = ebuf + sizeof(UPREFIX) - 1;;) {
! 54: *p++ = *--t;
! 55: if (t <= tmp)
! 56: break;
! 57: }
! 58: return(ebuf);
! 59: }
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