3 * Copyright (C) 2002 Simone Piccardi
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 2 of the License, or (at
8 * your option) any later version.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 /****************************************************************
22 * CGI for barcode generation
24 * Author: Simone Piccardi
27 * Usage: cgi-bin for apache.
28 * Called by downloading something like:
29 * http://localhost/cgi-bin/barcode?string
30 * where string is the code to be converted
32 * $Id: BarCodePage.c,v 1.2 2002/08/10 14:22:53 piccardi Exp $
34 ****************************************************************/
36 * Include needed headers
38 #include <sys/types.h> /* predefined types */
39 #include <sys/stat.h> /* stat deinitiions */
40 #include <unistd.h> /* include unix standard library */
41 #include <stdio.h> /* include standard I/O library */
42 #include <stdlib.h> /* include standard library */
43 #include <string.h> /* include string library */
44 #include <wait.h> /* include wait call */
50 void WriteMess(char *mess);
53 int main(int argc, char *argv[], char *envp[])
56 * Variables definition
62 char content[]="Content-type: image/jpeg\n\n";
67 /* create two pipes, pipein and pipeout, to handle communication */
68 if ( (retval = pipe(pipein)) ) {
69 WriteMess("input pipe creation error");
72 if ( (retval = pipe(pipeout)) ) {
73 WriteMess("output pipe creation error");
76 /* First fork: use child to run barcode program */
77 if ( (pid = fork()) == -1 ) {
78 WriteMess("child creation error");
84 * Child exec barcode program, that take input (string to encode)
85 * from pipein, remapped to stdin, and write the output (a PS
86 * image) to stdout, remapped to pipeout
88 close(pipein[1]); /* close output side of input pipe */
89 dup2(pipein[0], STDIN_FILENO); /* remap stdin in pipe input */
91 dup2(pipeout[1], STDOUT_FILENO); /* remap stdout in pipe output */
92 execlp("barcode", "barcode", size, NULL);
95 * Parent write string to pipe input and close it,
96 * then wait child execution and results form pipeout,
97 * then fork to convert PS to JPEG using gs
99 close(pipein[0]); /* close input side of input pipe */
100 write(pipein[1], argv[1], strlen(argv[1]));
102 waitpid(pid, NULL, 0);
103 /* Second fork: use child to run ghostscript*/
104 if ( (pid = fork()) == -1) {
105 WriteMess("child creation error");
108 /* second child, convert PS to JPEG */
110 close(pipeout[1]); /* close write end */
111 dup2(pipeout[0], STDIN_FILENO); /* remap read end to stdin */
113 write(STDOUT_FILENO, content, strlen(content));
114 execlp("gs", "gs", "-q", "-sDEVICE=jpeg", "-sOutputFile=-", "-", NULL);
118 waitpid(pid, NULL, 0);
122 * Routine to produce an HTML error message on output
124 void WriteMess(char *mess)
126 printf("Content-type: text/html\n\n");