127 lines
3.1 KiB
C
127 lines
3.1 KiB
C
#include <sys/types.h>
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#include <stdio.h>
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#include <string.h>
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#include <ctype.h>
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#include <limits.h>
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#include <stdlib.h>
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#include <regex.h>
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#include "utils.h"
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#include "regerror.ih"
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/*
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= #define REG_OKAY 0
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= #define REG_NOMATCH 1
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= #define REG_BADPAT 2
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= #define REG_ECOLLATE 3
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= #define REG_ECTYPE 4
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= #define REG_EESCAPE 5
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= #define REG_ESUBREG 6
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= #define REG_EBRACK 7
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= #define REG_EPAREN 8
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= #define REG_EBRACE 9
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= #define REG_BADBR 10
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= #define REG_ERANGE 11
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= #define REG_ESPACE 12
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= #define REG_BADRPT 13
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= #define REG_EMPTY 14
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= #define REG_ASSERT 15
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= #define REG_INVARG 16
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= #define REG_ATOI 255 // convert name to number (!)
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= #define REG_ITOA 0400 // convert number to name (!)
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*/
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static struct rerr {
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int code;
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char *name;
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char *explain;
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} rerrs[] = {
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REG_OKAY, "REG_OKAY", "no errors detected",
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REG_NOMATCH, "REG_NOMATCH", "regexec() failed to match",
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REG_BADPAT, "REG_BADPAT", "invalid regular expression",
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REG_ECOLLATE, "REG_ECOLLATE", "invalid collating element",
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REG_ECTYPE, "REG_ECTYPE", "invalid character class",
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REG_EESCAPE, "REG_EESCAPE", "trailing backslash (\\)",
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REG_ESUBREG, "REG_ESUBREG", "invalid backreference number",
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REG_EBRACK, "REG_EBRACK", "brackets ([ ]) not balanced",
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REG_EPAREN, "REG_EPAREN", "parentheses not balanced",
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REG_EBRACE, "REG_EBRACE", "braces not balanced",
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REG_BADBR, "REG_BADBR", "invalid repetition count(s)",
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REG_ERANGE, "REG_ERANGE", "invalid character range",
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REG_ESPACE, "REG_ESPACE", "out of memory",
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REG_BADRPT, "REG_BADRPT", "repetition-operator operand invalid",
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REG_EMPTY, "REG_EMPTY", "empty (sub)expression",
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REG_ASSERT, "REG_ASSERT", "\"can't happen\" -- you found a bug",
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REG_INVARG, "REG_INVARG", "invalid argument to regex routine",
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-1, "", "*** unknown regexp error code ***",
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};
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/*
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- regerror - the interface to error numbers
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= extern size_t regerror(int, const regex_t *, char *, size_t);
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*/
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/* ARGSUSED */
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size_t
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regerror(errcode, preg, errbuf, errbuf_size)
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int errcode;
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const regex_t *preg;
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char *errbuf;
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size_t errbuf_size;
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{
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register struct rerr *r;
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register size_t len;
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register int target = errcode &~ REG_ITOA;
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register char *s;
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char convbuf[50];
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if (errcode == REG_ATOI)
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s = regatoi(preg, convbuf);
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else {
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for (r = rerrs; r->code >= 0; r++)
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if (r->code == target)
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break;
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if (errcode®_ITOA) {
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if (r->code >= 0)
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(void) strcpy(convbuf, r->name);
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else
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sprintf(convbuf, "REG_0x%x", target);
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assert(strlen(convbuf) < sizeof(convbuf));
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s = convbuf;
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} else
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s = r->explain;
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}
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len = strlen(s) + 1;
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if (errbuf_size > 0) {
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if (errbuf_size > len)
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(void) strcpy(errbuf, s);
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else {
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(void) strncpy(errbuf, s, errbuf_size-1);
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errbuf[errbuf_size-1] = '\0';
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}
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}
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return(len);
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}
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/*
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- regatoi - internal routine to implement REG_ATOI
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== static char *regatoi(const regex_t *preg, char *localbuf);
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*/
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static char *
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regatoi(preg, localbuf)
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const regex_t *preg;
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char *localbuf;
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{
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register struct rerr *r;
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for (r = rerrs; r->code >= 0; r++)
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if (strcmp(r->name, preg->re_endp) == 0)
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break;
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if (r->code < 0)
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return("0");
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sprintf(localbuf, "%d", r->code);
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return(localbuf);
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}
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