Moving to 2.13.2.

1 files changed, 90 insertions, 0 deletions

diff --git a/pc/popen.c b/pc/popen.c
new file mode 100644
index 00000000..48952c22
--- /dev/null
+++ b/pc/popen.c
@@ -0,0 +1,90 @@
+#include <stdio.h>
+#include "popen.h"
+#include <io.h>
+#include <string.h>
+#include <process.h>
+
+static char template[] = "piXXXXXX";
+typedef enum { unopened = 0, reading, writing } pipemode;
+static
+struct {
+    char *command;
+    char *name;
+    pipemode pmode;
+} pipes[_NFILE];
+
+FILE *
+popen( char *command, char *mode ) {
+    FILE *current;
+    char *name;
+    int cur;
+    pipemode curmode;
+    /*
+    ** decide on mode.
+    */
+    if(strcmp(mode,"r") == 0)
+        curmode = reading;
+    else if(strcmp(mode,"w") == 0)
+        curmode = writing;
+    else
+        return NULL;
+    /*
+    ** get a name to use.
+    */
+    if((name = tempnam(".","pip"))==NULL)
+        return NULL;
+    /*
+    ** If we're reading, just call system to get a file filled with
+    ** output.
+    */
+    if(curmode == reading) {
+        char cmd[256];
+        sprintf(cmd,"%s > %s",command,name);
+        system(cmd);
+        if((current = fopen(name,"r")) == NULL)
+            return NULL;
+    } else {
+        if((current = fopen(name,"w")) == NULL)
+            return NULL;
+    }
+    cur = fileno(current);
+    pipes[cur].name = name;
+    pipes[cur].pmode = curmode;
+    pipes[cur].command = strdup(command);
+    return current;
+}
+
+int
+pclose( FILE * current) {
+    int cur = fileno(current),rval;
+    /*
+    ** check for an open file.
+    */
+    if(pipes[cur].pmode == unopened)
+        return -1;
+    if(pipes[cur].pmode == reading) {
+        /*
+        ** input pipes are just files we're done with.
+        */
+        rval = fclose(current);
+        unlink(pipes[cur].name);
+    } else {
+        /*
+        ** output pipes are temporary files we have
+        ** to cram down the throats of programs.
+        */
+        char command[256];
+        fclose(current);
+        sprintf(command,"%s < %s",pipes[cur].command,pipes[cur].name);
+        rval = system(command);
+        unlink(pipes[cur].name);
+    }
+    /*
+    ** clean up current pipe.
+    */
+    pipes[cur].pmode = unopened;
+    free(pipes[cur].name);
+    free(pipes[cur].command);
+    return rval;
+}
+