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regerror.c revision 1.2 
      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, const regex_t *, char *, size_t);
     59  */
     60 /* ARGSUSED */
     61 size_t
     62 regerror(errcode, preg, errbuf, errbuf_size)
     63 int errcode;
     64 const regex_t *preg;
     65 char *errbuf;
     66 size_t errbuf_size;
     67 {
     68 	register struct rerr *r;
     69 	register size_t len;
     70 	register int target = errcode &~ REG_ITOA;
     71 	register char *s;
     72 	char convbuf[50];
     73 
     74 	if (errcode == REG_ATOI)
     75 		s = regatoi(preg, convbuf);
     76 	else {
     77 		for (r = rerrs; r->code != 0; r++)
     78 			if (r->code == target)
     79 				break;
     80 
     81 		if (errcode&REG_ITOA) {
     82 			if (r->code != 0)
     83 				(void) strcpy(convbuf, r->name);
     84 			else
     85 				sprintf(convbuf, "REG_0x%x", target);
     86 			assert(strlen(convbuf) < sizeof(convbuf));
     87 			s = convbuf;
     88 		} else
     89 			s = r->explain;
     90 	}
     91 
     92 	len = strlen(s) + 1;
     93 	if (errbuf_size > 0) {
     94 		if (errbuf_size > len)
     95 			(void) strcpy(errbuf, s);
     96 		else {
     97 			(void) strncpy(errbuf, s, errbuf_size-1);
     98 			errbuf[errbuf_size-1] = '\0';
     99 		}
    100 	}
    101 
    102 	return(len);
    103 }
    104 
    105 /*
    106  - regatoi - internal routine to implement REG_ATOI
    107  == static char *regatoi(const regex_t *preg, char *localbuf);
    108  */
    109 static char *
    110 regatoi(preg, localbuf)
    111 const regex_t *preg;
    112 char *localbuf;
    113 {
    114 	register struct rerr *r;
    115 	register size_t siz;
    116 	register char *p;
    117 
    118 	for (r = rerrs; r->code != 0; r++)
    119 		if (strcmp(r->name, preg->re_endp) == 0)
    120 			break;
    121 	if (r->code == 0)
    122 		return("0");
    123 
    124 	sprintf(localbuf, "%d", r->code);
    125 	return(localbuf);
    126 }
    127