Finita la conversione dei listati in file separati. Passato anche alla nuova

[gapil.git] / listati / BarCodePage.c

diff --git a/listati/BarCodePage.c b/listati/BarCodePage.c
new file mode 100644 (file)
index 0000000..26a8290
--- /dev/null
+++ b/listati/BarCodePage.c
@@ -0,0 +1,47 @@
+int main(int argc, char *argv[], char *envp[])
+{
+    ...
+    /* create two pipes, pipein and pipeout, to handle communication */
+    if ( (retval = pipe(pipein)) ) {
+        WriteMess("input pipe creation error");
+        exit(0);        
+    }
+    if ( (retval = pipe(pipeout)) ) {
+        WriteMess("output pipe creation error");
+        exit(0);        
+    }    
+    /* First fork: use child to run barcode program */
+    if ( (pid = fork()) == -1) {          /* on error exit */
+        WriteMess("child creation error");
+        exit(0);        
+    }
+    /* if child */
+    if (pid == 0) {
+        close(pipein[1]);                /* close pipe write end  */
+        dup2(pipein[0], STDIN_FILENO);   /* remap stdin to pipe read end */
+        close(pipeout[0]);
+        dup2(pipeout[1], STDOUT_FILENO); /* remap stdout in pipe output */
+        execlp("barcode", "barcode", size, NULL);
+    } 
+    close(pipein[0]);                    /* close input side of input pipe */
+    write(pipein[1], argv[1], strlen(argv[1]));  /* write parameter to pipe */
+    close(pipein[1]);                    /* closing write end */
+    waitpid(pid, NULL, 0);               /* wait child completion */
+    /* Second fork: use child to run ghostscript */
+    if ( (pid = fork()) == -1) {
+        WriteMess("child creation error");
+        exit(0);
+    }
+    /* second child, convert PS to JPEG  */
+    if (pid == 0) {                     
+        close(pipeout[1]);              /* close write end */
+        dup2(pipeout[0], STDIN_FILENO); /* remap read end to stdin */
+        /* send mime type */
+        write(STDOUT_FILENO, content, strlen(content));
+        execlp("gs", "gs", "-q", "-sDEVICE=jpeg", "-sOutputFile=-", "-", NULL);
+    }
+    /* still parent */
+    close(pipeout[1]); 
+    waitpid(pid, NULL, 0);
+    exit(0);
+}