parsing.c

   1 /* config.c: parsing of config files
   2  *
   3  * Copyright (C) 2006 Lars Hjemli
   4  *
   5  * Licensed under GNU General Public License v2
   6  *   (see COPYING for full license text)
   7  */
   8
   9 #include "cgit.h"
  10
  11 int next_char(FILE *f)
  12 {
  13         int c = fgetc(f);
  14         if (c=='\r') {
  15                 c = fgetc(f);
  16                 if (c!='\n') {
  17                         ungetc(c, f);
  18                         c = '\r';
  19                 }
  20         }
  21         return c;
  22 }
  23
  24 void skip_line(FILE *f)
  25 {
  26         int c;
  27
  28         while((c=next_char(f)) && c!='\n' && c!=EOF)
  29                 ;
  30 }
  31
  32 int read_config_line(FILE *f, char *line, const char **value, int bufsize)
  33 {
  34         int i = 0, isname = 0;
  35
  36         *value = NULL;
  37         while(i<bufsize-1) {
  38                 int c = next_char(f);
  39                 if (!isname && (c=='#' || c==';')) {
  40                         skip_line(f);
  41                         continue;
  42                 }
  43                 if (!isname && isspace(c))
  44                         continue;
  45
  46                 if (c=='=' && !*value) {
  47                         line[i] = 0;
  48                         *value = &line[i+1];
  49                 } else if (c=='\n' && !isname) {
  50                         i = 0;
  51                         continue;
  52                 } else if (c=='\n' || c==EOF) {
  53                         line[i] = 0;
  54                         break;
  55                 } else {
  56                         line[i]=c;
  57                 }
  58                 isname = 1;
  59                 i++;
  60         }
  61         line[i+1] = 0;
  62         return i;
  63 }
  64
  65 int cgit_read_config(const char *filename, configfn fn)
  66 {
  67         static int nesting;
  68         int len;
  69         char line[256];
  70         const char *value;
  71         FILE *f;
  72
  73         /* cancel deeply nested include-commands */
  74         if (nesting > 8)
  75                 return -1;
  76         if (!(f = fopen(filename, "r")))
  77                 return -1;
  78         nesting++;
  79         while((len = read_config_line(f, line, &value, sizeof(line))) > 0)
  80                 (*fn)(line, value);
  81         nesting--;
  82         fclose(f);
  83         return 0;
  84 }
  85
  86 char *convert_query_hexchar(char *txt)
  87 {
  88         int d1, d2;
  89         if (strlen(txt) < 3) {
  90                 *txt = '\0';
  91                 return txt-1;
  92         }
  93         d1 = hextoint(*(txt+1));
  94         d2 = hextoint(*(txt+2));
  95         if (d1<0 || d2<0) {
  96                 strcpy(txt, txt+3);
  97                 return txt-1;
  98         } else {
  99                 *txt = d1 * 16 + d2;
 100                 strcpy(txt+1, txt+3);
 101                 return txt;
 102         }
 103 }
 104
 105 int cgit_parse_query(char *txt, configfn fn)
 106 {
 107         char *t, *value = NULL, c;
 108
 109         if (!txt)
 110                 return 0;
 111
 112         t = txt = xstrdup(txt);
 113
 114         while((c=*t) != '\0') {
 115                 if (c=='=') {
 116                         *t = '\0';
 117                         value = t+1;
 118                 } else if (c=='+') {
 119                         *t = ' ';
 120                 } else if (c=='%') {
 121                         t = convert_query_hexchar(t);
 122                 } else if (c=='&') {
 123                         *t = '\0';
 124                         (*fn)(txt, value);
 125                         txt = t+1;
 126                         value = NULL;
 127                 }
 128                 t++;
 129         }
 130         if (t!=txt)
 131                 (*fn)(txt, value);
 132         return 0;
 133 }
 134
 135 char *substr(const char *head, const char *tail)
 136 {
 137         char *buf;
 138
 139         buf = xmalloc(tail - head + 1);
 140         strncpy(buf, head, tail - head);
 141         buf[tail - head] = '\0';
 142         return buf;
 143 }
 144
 145 struct commitinfo *cgit_parse_commit(struct commit *commit)
 146 {
 147         struct commitinfo *ret;
 148         char *p = commit->buffer, *t = commit->buffer;
 149
 150         ret = xmalloc(sizeof(*ret));
 151         ret->commit = commit;
 152         ret->author = NULL;
 153         ret->author_email = NULL;
 154         ret->committer = NULL;
 155         ret->committer_email = NULL;
 156         ret->subject = NULL;
 157         ret->msg = NULL;
 158
 159         if (strncmp(p, "tree ", 5))
 160                 die("Bad commit: %s", sha1_to_hex(commit->object.sha1));
 161         else
 162                 p += 46; // "tree " + hex[40] + "\n"
 163
 164         while (!strncmp(p, "parent ", 7))
 165                 p += 48; // "parent " + hex[40] + "\n"
 166
 167         if (!strncmp(p, "author ", 7)) {
 168                 p += 7;
 169                 t = strchr(p, '<') - 1;
 170                 ret->author = substr(p, t);
 171                 p = t;
 172                 t = strchr(t, '>') + 1;
 173                 ret->author_email = substr(p, t);
 174                 ret->author_date = atol(++t);
 175                 p = strchr(t, '\n') + 1;
 176         }
 177
 178         if (!strncmp(p, "committer ", 9)) {
 179                 p += 9;
 180                 t = strchr(p, '<') - 1;
 181                 ret->committer = substr(p, t);
 182                 p = t;
 183                 t = strchr(t, '>') + 1;
 184                 ret->committer_email = substr(p, t);
 185                 ret->committer_date = atol(++t);
 186                 p = strchr(t, '\n') + 1;
 187         }
 188
 189         while (*p == '\n')
 190                 p = strchr(p, '\n') + 1;
 191
 192         t = strchr(p, '\n');
 193         if (t && *t) {
 194                 ret->subject = substr(p, t);
 195                 p = t + 1;
 196
 197                 while (*p == '\n')
 198                         p = strchr(p, '\n') + 1;
 199                 ret->msg = p;
 200         }
 201         return ret;
 202 }
 203
 204
 205 struct taginfo *cgit_parse_tag(struct tag *tag)
 206 {
 207         void *data;
 208         enum object_type type;
 209         unsigned long size;
 210         char *p, *t;
 211         struct taginfo *ret;
 212
 213         data = read_sha1_file(tag->object.sha1, &type, &size);
 214         if (!data || type != OBJ_TAG) {
 215                 free(data);
 216                 return 0;
 217         }
 218
 219         ret = xmalloc(sizeof(*ret));
 220         ret->tagger = NULL;
 221         ret->tagger_email = NULL;
 222         ret->tagger_date = 0;
 223         ret->msg = NULL;
 224
 225         p = data;
 226
 227         while (p && *p) {
 228                 if (*p == '\n')
 229                         break;
 230
 231                 if (!strncmp(p, "tagger ", 7)) {
 232                         p += 7;
 233                         t = strchr(p, '<') - 1;
 234                         ret->tagger = substr(p, t);
 235                         p = t;
 236                         t = strchr(t, '>') + 1;
 237                         ret->tagger_email = substr(p, t);
 238                         ret->tagger_date = atol(++t);
 239                 }
 240                 p = strchr(p, '\n') + 1;
 241         }
 242
 243         while (p && (*p == '\n'))
 244                 p = strchr(p, '\n') + 1;
 245         if (p && *p)
 246                 ret->msg = xstrdup(p);
 247         free(data);
 248         return ret;
 249 }