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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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|
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#include "copyright.h" |
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|
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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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|
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#ifndef NFILE |
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#define NFILE 32 |
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#endif |
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|
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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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|
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|
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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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|
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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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|
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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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|
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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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} |
