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regerror.c revision 1.1 
      1 #include <sys/types.h>
      2 #include <stdio.h>
      3 #include <string.h>
      4 #include <ctype.h>
      5 #include <limits.h>
      6 #include <stdlib.h>
      7 #include <regex.h>
      8 
      9 #include "utils.h"
     10 #include "regerror.ih"
     11 
     12 /*
     13  = #define	REG_NOMATCH	 1
     14  = #define	REG_BADPAT	 2
     15  = #define	REG_ECOLLATE	 3
     16  = #define	REG_ECTYPE	 4
     17  = #define	REG_EESCAPE	 5
     18  = #define	REG_ESUBREG	 6
     19  = #define	REG_EBRACK	 7
     20  = #define	REG_EPAREN	 8
     21  = #define	REG_EBRACE	 9
     22  = #define	REG_BADBR	10
     23  = #define	REG_ERANGE	11
     24  = #define	REG_ESPACE	12
     25  = #define	REG_BADRPT	13
     26  = #define	REG_EMPTY	14
     27  = #define	REG_ASSERT	15
     28  = #define	REG_INVARG	16
     29  = #define	REG_ATOI	255	// convert name to number (!)
     30  = #define	REG_ITOA	0400	// convert number to name (!)
     31  */
     32 static struct rerr {
     33 	int code;
     34 	char *name;
     35 	char *explain;
     36 } rerrs[] = {
     37 	REG_NOMATCH,	"REG_NOMATCH",	"regexec() failed to match",
     38 	REG_BADPAT,	"REG_BADPAT",	"invalid regular expression",
     39 	REG_ECOLLATE,	"REG_ECOLLATE",	"invalid collating element",
     40 	REG_ECTYPE,	"REG_ECTYPE",	"invalid character class",
     41 	REG_EESCAPE,	"REG_EESCAPE",	"trailing backslash (\\)",
     42 	REG_ESUBREG,	"REG_ESUBREG",	"invalid backreference number",
     43 	REG_EBRACK,	"REG_EBRACK",	"brackets ([ ]) not balanced",
     44 	REG_EPAREN,	"REG_EPAREN",	"parentheses not balanced",
     45 	REG_EBRACE,	"REG_EBRACE",	"braces not balanced",
     46 	REG_BADBR,	"REG_BADBR",	"invalid repetition count(s)",
     47 	REG_ERANGE,	"REG_ERANGE",	"invalid character range",
     48 	REG_ESPACE,	"REG_ESPACE",	"out of memory",
     49 	REG_BADRPT,	"REG_BADRPT",	"repetition-operator operand invalid",
     50 	REG_EMPTY,	"REG_EMPTY",	"empty (sub)expression",
     51 	REG_ASSERT,	"REG_ASSERT",	"\"can't happen\" -- you found a bug",
     52 	REG_INVARG,	"REG_INVARG",	"invalid argument to regex routine",
     53 	0,		"",		"*** unknown regexp error code ***",
     54 };
     55 
     56 /*
     57  - regerror - the interface to error numbers
     58  = extern size_t regerror(int errcode, const regex_t *preg, char *errbuf, \
     59  =							size_t errbuf_size);
     60  */
     61 /* ARGSUSED */
     62 size_t
     63 regerror(errcode, preg, errbuf, errbuf_size)
     64 int errcode;
     65 const regex_t *preg;
     66 char *errbuf;
     67 size_t errbuf_size;
     68 {
     69 	register struct rerr *r;
     70 	register size_t len;
     71 	register int target = errcode &~ REG_ITOA;
     72 	register char *s;
     73 	char convbuf[50];
     74 
     75 	if (errcode == REG_ATOI)
     76 		s = regatoi(preg, convbuf);
     77 	else {
     78 		for (r = rerrs; r->code != 0; r++)
     79 			if (r->code == target)
     80 				break;
     81 
     82 		if (errcode&REG_ITOA) {
     83 			if (r->code != 0)
     84 				(void) strcpy(convbuf, r->name);
     85 			else
     86 				sprintf(convbuf, "REG_0x%x", target);
     87 			assert(strlen(convbuf) < sizeof(convbuf));
     88 			s = convbuf;
     89 		} else
     90 			s = r->explain;
     91 	}
     92 
     93 	len = strlen(s) + 1;
     94 	if (errbuf_size > 0) {
     95 		if (errbuf_size > len)
     96 			(void) strcpy(errbuf, s);
     97 		else {
     98 			(void) strncpy(errbuf, s, errbuf_size-1);
     99 			errbuf[errbuf_size-1] = '\0';
    100 		}
    101 	}
    102 
    103 	return(len);
    104 }
    105 
    106 /*
    107  - regatoi - internal routine to implement REG_ATOI
    108  = static char *regatoi(const regex_t *preg, char *localbuf);
    109  */
    110 static char *
    111 regatoi(preg, localbuf)
    112 const regex_t *preg;
    113 char *localbuf;
    114 {
    115 	register struct rerr *r;
    116 	register size_t siz;
    117 	register char *p;
    118 
    119 	for (r = rerrs; r->code != 0; r++)
    120 		if (strcmp(r->name, preg->re_endp) == 0)
    121 			break;
    122 	if (r->code == 0)
    123 		return("0");
    124 
    125 	sprintf(localbuf, "%d", r->code);
    126 	return(localbuf);
    127 }
    128