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Date: Sun, 11 Jan 2009 14:12:40 -0800
To: zsh-workers@sunsite.dk
From: Dave Yost <Dave@Yost.com>
Subject: embedding C code in a shell script
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Hi.

It just occurred to me that with very little work, zsh could add this 
feature using similar techniques to the what you can read about here:
   http://yost.com/computers/compileAndGo/index.html#Future

So, for example, one could embed a C function to call realpath(3).

You could compile the code as a separate command, or you could do 
more work and dynamically link it in and call it.

Dave

compiledFunction realpath() {
compiler    = gcc
compileAndGo

#include <stdio.h>
#include <sys/param.h>
#include <stdlib.h>

int main(int argc, char *argv[]) {
   int ind;
   int trouble = 0;
   char resolvedPath[MAXPATHLEN];
   // printf("Invoked as %s\n", argv[0]);
   if (argc <= 1) {
     fprintf(stderr, "\nUsage: realpath path ...\n\nExit 1 if any 
paths fail.\n\n");
     exit(2);
   }
   for (ind = 1; ind < argc; ++ind) {
     if (realpath(argv[ind], resolvedPath) == NULL) {
       fprintf(stderr, "%s: No such path: %s\n", argv[1], argv[ind]);
       trouble = 1;
     } else {
       printf("%s\n", resolvedPath);
     }
   }
   exit(trouble ? 1 : 0);
}

compileAndGo