Varie correzioni, completata revisione capitolo sull'I/O su file

[gapil.git] / sources / BarCode.c

diff --git a/sources/BarCode.c b/sources/BarCode.c
index 44a08dab1a0924c7296cf20bbcf9bd686353b80b..872eacedf6fcc246126b9288029b25dd38dc59af 100644 (file)
--- a/sources/BarCode.c
+++ b/sources/BarCode.c
@@ -29,27 +29,22 @@
  * http://localhost/cgi-bin/barcode?string
  * where string is the code to be converted
  *
- * $Id: BarCode.c,v 1.3 2002/06/23 22:03:28 piccardi Exp $ 
- *
  ****************************************************************/
 /* 
  * Include needed headers
  */
-#include <sys/types.h>   /* predefined types */
-#include <sys/stat.h>    /* stat deinitiions */
-#include <unistd.h>      /* include unix standard library */
-/* */
-#include <stdio.h>      /* include standard I/O library */
-#include <stdlib.h>     /* include standard library */
-#include <string.h>     /* include string library */
-#include <wait.h>       /* include wait call */
-#include <fcntl.h>
-#include <assert.h>
-#include <time.h>
+#include <sys/types.h>   /* primitive system data types */
+#include <sys/stat.h>    /* file characteristics constants and functions */
+#include <unistd.h>      /* unix standard library */
+#include <stdio.h>      /* standard I/O library */
+#include <stdlib.h>     /* C standard library */
+#include <string.h>     /* C strings library */
+#include <wait.h>       /* process termination constants and functions */
+#include <fcntl.h>      /* file control functions */
+#include <assert.h>     /* C assertion functions */
+#include <time.h>        /* date and time constants, types and functions */
 
 #include"macros.h"
-void WriteMess(char *mess);
-
 
 /* Program begin */
 int main(int argc, char *argv[], char *envp[])
@@ -57,31 +52,31 @@ int main(int argc, char *argv[], char *envp[])
 /*
  * Variables definition         
  */
-    FILE *file1, *file2, *file3;
-    char content[]="Content-type: image/jpeg\n\n";
-    /* 
-     * Begin
-     */
-    /* write mime-type to stout */ 
+    FILE *pipe[4];
+    FILE *pipein;
+    char *cmd_string[4]={
+       "pnmtopng",
+       "pnmmargin -white 10",
+       "pnmcrop",
+       "gs -sDEVICE=ppmraw -sOutputFile=- -sNOPAUSE -q - -c showpage -c quit"
+    }; 
+    char content[]="Content-type: image/png\n\n";
+    int i;
+    /* write mime-type to stdout */ 
     write(STDOUT_FILENO, content, strlen(content));
-    /* convert PDF to JPEG */
-    file1 = popen("gs -q -sDEVICE=jpeg -sOutputFile=- -", "w");
-    /* convert EPS to PDF*/
-    dup2(fileno(file1), STDOUT_FILENO);  /* set epstopdf stdout to file1 */
-    file2 = popen("epstopdf --filter", "w");
-//    file2 = popen("eps2eps", "w");
-    /* create barcode */
-    dup2(fileno(file2), STDOUT_FILENO);  /* set barcode stdout to file2 */
-    file3 = popen("barcode -E", "w");     
-    write(fileno(file3), argv[1], strlen(argv[1]));
+    /* execute chain of command */
+    for (i=0; i<4; i++) {
+       pipe[i] = popen(cmd_string[i], "w");
+       dup2(fileno(pipe[i]), STDOUT_FILENO); 
+    }
+    /* create barcode (in PS) */
+    pipein = popen("barcode", "w");
+    /* send barcode string to barcode program */
+    write(fileno(pipein), argv[1], strlen(argv[1]));
+    pclose(pipein);
+    /* close all pipes (in reverse order) */
+    for (i=4; i==0; i--) {
+       pclose((pipe[i]));
+    }
     exit(0);
 }
-/*
- * Routine to produce an HTML error message on output 
- */
-void WriteMess(char *mess)
-{
-    printf("Content-type: text/html\n\n");
-    perror(mess);
-    printf("<br>\n");
-}