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- #include <stdio.h>
- #include <stdlib.h>
- #include "popen.h"
- #include <string.h>
-
- #ifndef AMIGA
- static char template[] = "piXXXXXX";
- #else
- static void mkcmd(char *, char *, char, char *);
- extern char *mktemp(char *);
- #endif
-
- typedef enum { unopened = 0, reading, writing } pipemode;
- static
- struct {
- char *command;
- char *name;
- pipemode pmode;
- } pipes[FOPEN_MAX];
-
- FILE *
- popen( const char *command, const char *mode ) {
- FILE *current;
- char *name;
- int cur;
- pipemode curmode;
- #ifdef AMIGA
- char template[] = "T:piXXXXXX";
- #endif
- /*
- ** 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.
- */
- #ifdef AMIGA
- name = mktemp(template);
- #else
- if((name = tempnam(".","pip"))==NULL)
- return NULL;
- #endif
- /*
- ** If we're reading, just call system to get a file filled with
- ** output.
- */
- if(curmode == reading) {
- char cmd[256];
- #ifdef AMIGA
- mkcmd(cmd, command, '>', name);
- #else
- sprintf(cmd,"%s > %s",command,name);
- #endif
- 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 = strdup(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);
- #ifdef AMIGA
- mkcmd(command, pipes[cur].command, '<', pipes[cur].name);
- #else
- sprintf(command,"%s < %s",pipes[cur].command,pipes[cur].name);
- #endif
- 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;
- }
- #ifdef AMIGA
- /* ^%#@%! Amiga CLI requires I/O redirection immediately after command name.
- Assume command name ends at first space and place redirection there */
-
- static void
- mkcmd(char *cmd, char *command, char op, char *name)
- {
- while (*command == ' ') {
- command++;
- }
- while (*command != ' ' && *command != '\000') {
- *cmd++ = *command++;
- }
- *cmd++ = ' ';
- *cmd++ = op;
- strcpy(cmd, name);
- cmd += strlen(name);
- while (*command != '\000') {
- *cmd++ = *command++;
- }
- *cmd = '\000';
- return;
- }
- #endif
-