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#ifndef lint
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static const char RCSid[] = "$Id$";
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#endif
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/*
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* popen() and pclose() calls for systems without pipe facilities
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*/
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#include "copyright.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include "paths.h"
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#ifndef NFILE
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#define NFILE 32
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#endif
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static struct {
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char *f; /* file name, NULL if inactive */
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char *c; /* command if writing */
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} pips[NFILE];
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FILE *
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popen(cmd, mode) /* open command for reading or writing */
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register char *cmd;
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char *mode;
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{
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FILE *fp;
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char *newcmd, *fname;
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register char *cp, *cp2 = NULL;
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int quote = '\0', paren = 0;
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while (isspace(*cmd))
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cmd++;
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if (!*cmd)
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return(NULL);
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fname = (char *)malloc(TEMPLEN+1);
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newcmd = (char *)malloc(TEMPLEN+6+strlen(cmd));
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if (fname == NULL | newcmd == NULL)
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return(NULL);
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mktemp(strcpy(fname,TEMPLATE));
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/* build our command */
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for (cp = newcmd; ; cmd++) {
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switch (*cmd) {
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case '\'':
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case '"':
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if (!quote)
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quote = *cmd;
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else if (quote == *cmd)
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quote = '\0';
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#ifdef MSDOS
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else
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break;
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*cp++ = '"'; /* double quotes only */
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continue;
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case '\\':
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if (!quote && cmd[1] == '\n') {
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*cp++ = ' ';
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cmd++;
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continue;
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}
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cmd++;
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break;
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#else
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break;
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case '\\':
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*cp++ = *cmd++;
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break;
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case '(':
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if (!quote)
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paren++;
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break;
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case ')':
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if (!quote && paren)
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paren--;
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break;
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case ';':
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#endif
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case '|':
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if (!quote && !paren && cp2 == NULL)
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cp2 = fname;
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break;
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case ' ':
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case '\t':
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if (!quote)
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while (isspace(cmd[1]))
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cmd++;
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break;
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case '\n':
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case '\0':
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if (cp2 == NULL)
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cp2 = fname;
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break;
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}
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if (cp2 == fname && *mode == 'w') { /* add input file */
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*cp++ = ' '; *cp++ = '<';
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while (*cp2)
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*cp++ = *cp2++;
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*cp++ = ' ';
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}
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if (!(*cp = *cmd))
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break;
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cp++;
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}
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if (*mode == 'r') { /* add output file */
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while (isspace(cp[-1]) || cp[-1] == ';')
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cp--;
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*cp++ = ' '; *cp++ = '>';
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while (*cp2)
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*cp++ = *cp2++;
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*cp = '\0';
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system(newcmd); /* execute command first */
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}
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if ((fp = fopen(fname, mode)) == NULL) { /* open file */
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free(fname);
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free(newcmd);
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return(NULL);
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}
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if (fileno(fp) >= NFILE) {
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eputs("popen: too many open files\n");
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quit(1);
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}
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pips[fileno(fp)].f = fname;
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if (*mode == 'r') {
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free(newcmd);
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pips[fileno(fp)].c = NULL;
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} else
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pips[fileno(fp)].c = newcmd;
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return(fp);
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}
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pclose(fp) /* close pipe and cleanup */
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FILE *fp;
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{
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register int pn = fileno(fp);
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if (pn >= NFILE || pips[pn].f == NULL || fclose(fp) == -1)
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return(-1);
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if (pips[pn].c != NULL) {
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system(pips[pn].c); /* execute command last */
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free(pips[pn].c);
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}
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unlink(pips[pn].f); /* remove temp file */
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free(pips[pn].f);
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pips[pn].f = NULL;
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return(0);
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}
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