mirror of https://gitee.com/openkylin/cups.git
78 lines
2.4 KiB
C
78 lines
2.4 KiB
C
#include <stddef.h>
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#include <stdio.h>
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#include <string.h>
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#include "regex.h"
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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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static size_t
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set_result(char *errbuf, size_t errbuf_size, char *result) {
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size_t result_len = strlen(result);
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if (errbuf_size > 0) {
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size_t copy_len = result_len < errbuf_size ? result_len : errbuf_size - 1;
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memcpy(errbuf, result, copy_len);
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errbuf[copy_len] = '\0';
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}
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return result_len + 1;
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}
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/*
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- regerror - the interface to error numbers
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*/
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size_t
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regerror(int errorcode, const regex_t *preg, char *errbuf, size_t errbuf_size)
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{
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struct rerr *r;
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char convbuf[50];
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if (errorcode == REG_ATOI) {
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if (preg == NULL || preg->re_endp == NULL)
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return set_result(errbuf, errbuf_size, "0");
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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 set_result(errbuf, errbuf_size, "0");
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snprintf(convbuf, sizeof convbuf, "%d", r->code);
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return set_result(errbuf, errbuf_size, convbuf);
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}
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else {
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int target = errorcode &~ REG_ITOA;
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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 (errorcode & REG_ITOA) {
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if (r->code >= 0)
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return set_result(errbuf, errbuf_size, r->name);
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snprintf(convbuf, sizeof convbuf, "REG_0x%x", target);
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return set_result(errbuf, errbuf_size, convbuf);
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}
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return set_result(errbuf, errbuf_size, r->explain);
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}
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}
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