1 /* 2 * Copyright (c) 1988, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #if defined(LIBC_SCCS) && !defined(lint) 9 static char sccsid[] = "@(#)strerror.c 8.1 (Berkeley) 06/04/93"; 10 #endif /* LIBC_SCCS and not lint */ 11 12 #include <string.h> 13 14 char * 15 strerror(num) 16 int num; 17 { 18 extern int sys_nerr; 19 extern char *sys_errlist[]; 20 #define UPREFIX "Unknown error: " 21 static char ebuf[40] = UPREFIX; /* 64-bit number + slop */ 22 register unsigned int errnum; 23 register char *p, *t; 24 char tmp[40]; 25 26 errnum = num; /* convert to unsigned */ 27 if (errnum < sys_nerr) 28 return(sys_errlist[errnum]); 29 30 /* Do this by hand, so we don't include stdio(3). */ 31 t = tmp; 32 do { 33 *t++ = "0123456789"[errnum % 10]; 34 } while (errnum /= 10); 35 for (p = ebuf + sizeof(UPREFIX) - 1;;) { 36 *p++ = *--t; 37 if (t <= tmp) 38 break; 39 } 40 return(ebuf); 41 } 42