src/j2.c



    1 /**
    2  * This CGI program renders the oper.io blog
    3  * Copyright (C) 2019 Aaron Ball <nullspoon@oper.io>
    4  *
    5  * This program is free software: you can redistribute it and/or modify
    6  * it under the terms of the GNU General Public License as published by
    7  * the Free Software Foundation, either version 3 of the License, or
    8  * (at your option) any later version.
    9  *
   10  * This program is distributed in the hope that it will be useful,
   11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   13  * GNU General Public License for more details.
   14  *
   15  * You should have received a copy of the GNU General Public License
   16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
   17  */
   18 #include "j2.h"
   19 
   20 
   21 int j2_readvar(FILE* fd, char* buf) {
   22   char c;
   23   int i = 0;
   24   fpos_t startpos;
   25 
   26   fgetpos(fd, &startpos);
   27   //long seekstart = SEEK_CUR;
   28 
   29   if((c = fgetc(fd)) != '{') {
   30     fsetpos(fd, &startpos);
   31     return -1;
   32   }
   33   if(fgetc(fd) != ' ') {
   34     fsetpos(fd, &startpos);
   35     return -1;
   36   }
   37 
   38   while((c = fgetc(fd)) != ' ') {
   39     buf[i] = c;
   40     i++;
   41   }
   42 
   43   buf[i] = '\0';
   44   return 1;
   45 }
   46 
   47 
   48 /**
   49  * Reads a jinja file and cats the output, interpolating variables, values from
   50  * matching environment variables.
   51  */
   52 int j2_cat(char* path) {
   53   char buf[512] = {'\0'};
   54   char c;
   55   FILE* fd = fopen(path, "r");
   56 
   57   while((c = fgetc(fd)) != EOF) {
   58     if(c == '{') {
   59       if(j2_readvar(fd, buf) == -1) {
   60         printf("{%s", buf);
   61         continue;
   62       }
   63 
   64       printf("%s", getenv(buf));
   65       fgetc(fd);
   66       fgetc(fd);
   67       continue;
   68     }
   69     printf("%c", c);
   70   }
   71 
   72   fclose(fd);
   73   return 0;
   74 }