t/helper/test-regex.c

   1 #include "test-tool.h"
   2 #include "gettext.h"
   3
   4 struct reg_flag {
   5         const char *name;
   6         int flag;
   7 };
   8
   9 static struct reg_flag reg_flags[] = {
  10         { "EXTENDED",   REG_EXTENDED    },
  11         { "NEWLINE",    REG_NEWLINE     },
  12         { "ICASE",      REG_ICASE       },
  13         { "NOTBOL",     REG_NOTBOL      },
  14         { "NOTEOL",     REG_NOTEOL      },
  15 #ifdef REG_STARTEND
  16         { "STARTEND",   REG_STARTEND    },
  17 #endif
  18         { NULL, 0 }
  19 };
  20
  21 static int test_regex_bug(void)
  22 {
  23         char *pat = "[^={} \t]+";
  24         char *str = "={}\nfred";
  25         regex_t r;
  26         regmatch_t m[1];
  27
  28         if (regcomp(&r, pat, REG_EXTENDED | REG_NEWLINE))
  29                 die("failed regcomp() for pattern '%s'", pat);
  30         if (regexec(&r, str, 1, m, 0))
  31                 die("no match of pattern '%s' to string '%s'", pat, str);
  32
  33         /* http://sourceware.org/bugzilla/show_bug.cgi?id=3957  */
  34         if (m[0].rm_so == 3) /* matches '\n' when it should not */
  35                 die("regex bug confirmed: re-build git with NO_REGEX=1");
  36
  37         return 0;
  38 }
  39
  40 int cmd__regex(int argc, const char **argv)
  41 {
  42         const char *pat;
  43         const char *str;
  44         int ret, silent = 0, flags = 0;
  45         regex_t r;
  46         regmatch_t m[1];
  47         char errbuf[64];
  48
  49         argv++;
  50         argc--;
  51
  52         if (!argc)
  53                 goto usage;
  54
  55         if (!strcmp(*argv, "--bug")) {
  56                 if (argc == 1)
  57                         return test_regex_bug();
  58                 else
  59                         goto usage;
  60         }
  61         if (!strcmp(*argv, "--silent")) {
  62                 silent = 1;
  63                 argv++;
  64                 argc--;
  65         }
  66         if (!argc)
  67                 goto usage;
  68
  69         pat = *argv++;
  70         if (argc == 1)
  71                 str = NULL;
  72         else {
  73                 str = *argv++;
  74                 while (*argv) {
  75                         struct reg_flag *rf;
  76                         for (rf = reg_flags; rf->name; rf++)
  77                                 if (!strcmp(*argv, rf->name)) {
  78                                         flags |= rf->flag;
  79                                         break;
  80                                 }
  81                         if (!rf->name)
  82                                 die("do not recognize flag %s", *argv);
  83                         argv++;
  84                 }
  85         }
  86         git_setup_gettext();
  87
  88         ret = regcomp(&r, pat, flags);
  89         if (ret) {
  90                 if (silent)
  91                         return ret;
  92
  93                 regerror(ret, &r, errbuf, sizeof(errbuf));
  94                 die("failed regcomp() for pattern '%s' (%s)", pat, errbuf);
  95         }
  96         if (!str)
  97                 return 0;
  98
  99         ret = regexec(&r, str, 1, m, 0);
 100         if (ret) {
 101                 if (silent || ret == REG_NOMATCH)
 102                         return ret;
 103
 104                 regerror(ret, &r, errbuf, sizeof(errbuf));
 105                 die("failed regexec() for subject '%s' (%s)", str, errbuf);
 106         }
 107
 108         return 0;
 109 usage:
 110         usage("\ttest-tool regex --bug\n"
 111               "\ttest-tool regex [--silent] <pattern>\n"
 112               "\ttest-tool regex [--silent] <pattern> <string> [<options>]");
 113         return -1;
 114 }