src/regex/regerror.c

   1 #if defined(__MWERKS__) && !defined(__MACH__)
   2 typedef long off_t ;
   3 #else
   4 #include <sys/types.h>
   5 #endif
   6 #include <stdio.h>
   7 #include <string.h>
   8 #include <ctype.h>
   9 #include <limits.h>
  10 #include <stdlib.h>
  11 #include "regex.h"
  12
  13 #include "utils.h"
  14 #include "regerror.ih"
  15
  16 /*
  17  = #define      REG_OKAY         0
  18  = #define      REG_NOMATCH      1
  19  = #define      REG_BADPAT       2
  20  = #define      REG_ECOLLATE     3
  21  = #define      REG_ECTYPE       4
  22  = #define      REG_EESCAPE      5
  23  = #define      REG_ESUBREG      6
  24  = #define      REG_EBRACK       7
  25  = #define      REG_EPAREN       8
  26  = #define      REG_EBRACE       9
  27  = #define      REG_BADBR       10
  28  = #define      REG_ERANGE      11
  29  = #define      REG_ESPACE      12
  30  = #define      REG_BADRPT      13
  31  = #define      REG_EMPTY       14
  32  = #define      REG_ASSERT      15
  33  = #define      REG_INVARG      16
  34  = #define      REG_ATOI        255     // convert name to number (!)
  35  = #define      REG_ITOA        0400    // convert number to name (!)
  36  */
  37 static struct rerr {
  38         int code;
  39         char *name;
  40         char *explain;
  41 } rerrs[] = {
  42         { REG_OKAY,     "REG_OKAY",     "no errors detected" },
  43         { REG_NOMATCH,  "REG_NOMATCH",  "regexec() failed to match" },
  44         { REG_BADPAT,   "REG_BADPAT",   "invalid regular expression" },
  45         { REG_ECOLLATE, "REG_ECOLLATE", "invalid collating element" },
  46         { REG_ECTYPE,   "REG_ECTYPE",   "invalid character class" },
  47         { REG_EESCAPE,  "REG_EESCAPE",  "trailing backslash (\\)" },
  48         { REG_ESUBREG,  "REG_ESUBREG",  "invalid backreference number" },
  49         { REG_EBRACK,   "REG_EBRACK",   "brackets ([ ]) not balanced" },
  50         { REG_EPAREN,   "REG_EPAREN",   "parentheses not balanced" },
  51         { REG_EBRACE,   "REG_EBRACE",   "braces not balanced" },
  52         { REG_BADBR,    "REG_BADBR",    "invalid repetition count(s)" },
  53         { REG_ERANGE,   "REG_ERANGE",   "invalid character range" },
  54         { REG_ESPACE,   "REG_ESPACE",   "out of memory" },
  55         { REG_BADRPT,   "REG_BADRPT",   "repetition-operator operand invalid" },
  56         { REG_EMPTY,    "REG_EMPTY",    "empty (sub)expression" },
  57         { REG_ASSERT,   "REG_ASSERT",   "\"can't happen\" -- you found a bug" },
  58         { REG_INVARG,   "REG_INVARG",   "invalid argument to regex routine" },
  59         { -1,           "",             "*** unknown regexp error code ***" },
  60 };
  61
  62 /*
  63  - regerror - the interface to error numbers
  64  = extern size_t regerror(int, const regex_t *, char *, size_t);
  65  */
  66 /* ARGSUSED */
  67 size_t
  68 regerror(errcode, preg, errbuf, errbuf_size)
  69 int errcode;
  70 const regex_t *preg;
  71 char *errbuf;
  72 size_t errbuf_size;
  73 {
  74         register struct rerr *r;
  75         register size_t len;
  76         register int target = errcode &~ REG_ITOA;
  77         register char *s;
  78         char convbuf[50];
  79
  80         if (errcode == REG_ATOI)
  81                 s = regatoi(preg, convbuf);
  82         else {
  83                 for (r = rerrs; r->code >= 0; r++)
  84                         if (r->code == target)
  85                                 break;
  86
  87                 if (errcode&REG_ITOA) {
  88                         if (r->code >= 0)
  89                                 (void) strcpy(convbuf, r->name);
  90                         else
  91                                 sprintf(convbuf, "REG_0x%x", target);
  92                         assert(strlen(convbuf) < sizeof(convbuf));
  93                         s = convbuf;
  94                 } else
  95                         s = r->explain;
  96         }
  97
  98         len = strlen(s) + 1;
  99         if (errbuf_size > 0) {
 100                 if (errbuf_size > len)
 101                         (void) strcpy(errbuf, s);
 102                 else {
 103                         (void) strncpy(errbuf, s, errbuf_size-1);
 104                         errbuf[errbuf_size-1] = '\0';
 105                 }
 106         }
 107
 108         return(len);
 109 }
 110
 111 /*
 112  - regatoi - internal routine to implement REG_ATOI
 113  == static char *regatoi(const regex_t *preg, char *localbuf);
 114  */
 115 static char *
 116 regatoi(preg, localbuf)
 117 const regex_t *preg;
 118 char *localbuf;
 119 {
 120         register struct rerr *r;
 121
 122         for (r = rerrs; r->code >= 0; r++)
 123                 if (strcmp(r->name, preg->re_endp) == 0)
 124                         break;
 125         if (r->code < 0)
 126                 return("0");
 127
 128         sprintf(localbuf, "%d", r->code);
 129         return(localbuf);
 130 }