| 1 |
#ifndef lint |
| 2 |
static const char RCSid[] = "$Id: win_popen.c,v 1.4 2004/10/04 10:14:22 schorsch Exp $"; |
| 3 |
#endif |
| 4 |
/* |
| 5 |
Replacement for the posix popen() on Windows |
| 6 |
|
| 7 |
We don't just let the shell do the work like the original. |
| 8 |
Since per default there's no decent shell around, we implement |
| 9 |
the most basic functionality right here. |
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|
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currently supports mode "r" and | to chain several processes. |
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Substrings between matching quotes are considered one word, |
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ignoring any | within. Quotes don't nest. |
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|
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*/ |
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|
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#include <windows.h> |
| 18 |
#include <stdlib.h> |
| 19 |
#include <stdio.h> |
| 20 |
#include <string.h> |
| 21 |
#include <ctype.h> |
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#include <io.h> /* _open_osfhandle() */ |
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#include <fcntl.h> /* _O_RDONLY */ |
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|
| 25 |
#include "paths.h" |
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#include "rtio.h" |
| 27 |
#include "rterror.h" |
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|
| 29 |
|
| 30 |
#define RAD_MAX_PIPES 32 /* maximum number of pipes */ |
| 31 |
|
| 32 |
#define R_MODE 1 |
| 33 |
#define W_MODE 2 |
| 34 |
#define A_MODE 3 |
| 35 |
|
| 36 |
static int parse_pipes(char *s, char *lines[], char **infn, char **outfn, |
| 37 |
int *append, int maxl); |
| 38 |
static BOOL createPipes(HANDLE*, HANDLE*, HANDLE*, HANDLE*); |
| 39 |
static BOOL runChild(char*, char*, HANDLE, HANDLE, HANDLE); |
| 40 |
static void resetStdHandles(HANDLE stdoutOrig, HANDLE stdinOrig); |
| 41 |
HANDLE newFile(char *fn, int mode); |
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|
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|
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int |
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win_pclose( /* posix pclose replacement */ |
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FILE* p |
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) |
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{ |
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fclose(p); |
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/* not sure if it's useful to wait for anything on Windows */ |
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return 0; |
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} |
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|
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|
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FILE * |
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win_popen( /* posix popen replacement */ |
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char* command, |
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char* type |
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) |
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{ |
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char *execfile, *args; |
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char *cmdlines[RAD_MAX_PIPES]; |
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char *infn = NULL, *outfn = NULL; |
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char executable[512], estr[512]; |
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int n, i, mode = 0, append = 0; |
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int ncmds = 0; |
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FILE *inf = NULL; |
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char *s = NULL; |
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HANDLE stdoutRd = NULL, stdoutWr = NULL; |
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HANDLE stdinRd = NULL, stdinWr = NULL; |
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HANDLE stderrWr = NULL; |
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HANDLE stdoutOrig, stdinOrig; |
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|
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if (strchr(type, 'w')) { |
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mode = W_MODE; |
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} else if (strchr(type, 'r')) { |
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mode = R_MODE; |
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} else { |
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_snprintf(estr, sizeof(estr), |
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"Invalid mode \"%s\" for win_popen().", type); |
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eputs(estr); |
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return NULL; |
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} |
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/* single quotes aren't removed, so change to double-quotes */ |
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for (s=command; *s; s++) |
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if (*s == '\'') |
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*s = '"'; |
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|
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stdoutOrig = GetStdHandle(STD_OUTPUT_HANDLE); |
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stdinOrig = GetStdHandle(STD_INPUT_HANDLE); |
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/* if we have a console, use it for error output */ |
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stderrWr = GetStdHandle(STD_ERROR_HANDLE); |
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|
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ncmds = parse_pipes(command,cmdlines,&infn,&outfn,&append,RAD_MAX_PIPES); |
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if(ncmds <= 0) { |
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eputs("Too many pipes or malformed command."); |
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goto error; |
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} |
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|
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if (infn != NULL) { |
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stdoutRd = newFile(infn, mode); |
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} |
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|
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for(n = 0; n < ncmds; ++n) { |
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if(!createPipes(&stdoutRd, &stdoutWr, |
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&stdinRd, &stdinWr)) { |
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eputs("Error creating pipe"); |
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goto error; |
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} |
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if (outfn != NULL && n == ncmds - 1) { |
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CloseHandle(stdoutWr); |
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CloseHandle(stdoutRd); |
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stdoutWr = newFile(outfn, mode); |
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} |
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if (n == 0 && mode == W_MODE) { |
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/* create a standard C file pointer for writing to the input */ |
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inf = _fdopen(_open_osfhandle((long)stdinWr, _O_RDONLY), "w"); |
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} |
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/* find the executable on the PATH */ |
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args = nextword(executable, sizeof(executable), cmdlines[n]); |
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if (args == NULL) { |
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eputs("Empty command."); |
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goto error; |
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} |
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execfile = getpath(executable, getenv("PATH"), X_OK); |
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if(execfile == NULL) { |
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_snprintf(estr, sizeof(estr), |
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"Can't find executable for \"%s\".", executable); |
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eputs(estr); |
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goto error; |
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} |
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if(!runChild(execfile, cmdlines[n], stdinRd, stdoutWr, stderrWr)) { |
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_snprintf(estr, sizeof(estr), |
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"Unable to execute executable \"%s\".", executable); |
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eputs(estr); |
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goto error; |
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} |
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/* close the stdout end just passed to the last process, |
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or the final read will block */ |
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CloseHandle(stdoutWr); |
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} |
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|
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/* clean up */ |
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resetStdHandles(stdinOrig, stdoutOrig); |
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for (i = 0; i < ncmds; i++) free(cmdlines[i]); |
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if (infn != NULL) free(infn); |
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if (outfn != NULL) free(outfn); |
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|
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if (mode == R_MODE) { |
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/* return a standard C file pointer for reading the output */ |
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return _fdopen(_open_osfhandle((long)stdoutRd, _O_RDONLY), "r"); |
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} else if (mode == W_MODE) { |
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/* return a standard C file pointer for writing to the input */ |
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return inf; |
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} |
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|
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error: |
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resetStdHandles(stdinOrig, stdoutOrig); |
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for (i = 0; i < ncmds; i++) free(cmdlines[i]); |
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if (infn != NULL) free(infn); |
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if (outfn != NULL) free(outfn); |
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return NULL; |
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} |
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|
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|
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HANDLE |
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newFile(char *fn, int mode) |
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{ |
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SECURITY_ATTRIBUTES sAttr; |
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HANDLE fh; |
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|
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sAttr.nLength = sizeof(SECURITY_ATTRIBUTES); |
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sAttr.bInheritHandle = TRUE; |
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sAttr.lpSecurityDescriptor = NULL; |
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|
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if (mode == R_MODE) { |
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fh = CreateFile(fn, |
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GENERIC_READ, |
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FILE_SHARE_READ, |
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&sAttr, |
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OPEN_EXISTING, |
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FILE_ATTRIBUTE_NORMAL, |
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NULL); |
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} else if (mode == W_MODE || mode == A_MODE) { |
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fh = CreateFile(fn, |
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GENERIC_WRITE, |
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FILE_SHARE_WRITE, |
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&sAttr, |
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mode==W_MODE?CREATE_ALWAYS:OPEN_ALWAYS, |
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FILE_ATTRIBUTE_NORMAL, |
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NULL); |
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} |
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if (fh == NULL) { |
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int e = GetLastError(); |
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} |
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return fh; |
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} |
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|
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|
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static BOOL |
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createPipes( /* establish matching pipes for a subprocess */ |
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HANDLE* stdoutRd, |
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HANDLE* stdoutWr, |
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HANDLE* stdinRd, |
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HANDLE* stdinWr |
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) |
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{ |
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HANDLE stdoutRdInh = NULL; |
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HANDLE stdinWrInh = NULL; |
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HANDLE curproc; |
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SECURITY_ATTRIBUTES sAttr; |
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|
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curproc = GetCurrentProcess(); |
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|
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/* The rules of inheritance for handles are a mess. |
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Just to be safe, make all handles we pass to the |
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child processes inheritable */ |
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sAttr.nLength = sizeof(SECURITY_ATTRIBUTES); |
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sAttr.bInheritHandle = TRUE; |
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sAttr.lpSecurityDescriptor = NULL; |
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|
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if(*stdoutRd != NULL){ |
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/* if we have a previous stdout pipe, |
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assign the other end to stdin for the new process */ |
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CloseHandle(*stdinRd); |
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if(!DuplicateHandle(curproc, *stdoutRd, |
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curproc, stdinRd, 0, |
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TRUE, DUPLICATE_SAME_ACCESS)) |
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return FALSE; |
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CloseHandle(*stdoutRd); |
| 231 |
if(!SetStdHandle(STD_INPUT_HANDLE, *stdinRd)) |
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return FALSE; |
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} else { |
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/* there's no previous stdout, create a new stdin pipe */ |
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if(!CreatePipe(stdinRd, &stdinWrInh, &sAttr, 0)) |
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return FALSE; |
| 237 |
if(!SetStdHandle(STD_INPUT_HANDLE, *stdinRd)) |
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return FALSE; |
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CloseHandle(stdinWrInh); |
| 240 |
} |
| 241 |
|
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/* create the stdout pipe for the new process */ |
| 243 |
if(!CreatePipe(&stdoutRdInh, stdoutWr, &sAttr, 0)) |
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return FALSE; |
| 245 |
if(!SetStdHandle(STD_OUTPUT_HANDLE, *stdoutWr)) |
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return FALSE; |
| 247 |
if(!DuplicateHandle(curproc, stdoutRdInh, |
| 248 |
curproc, stdoutRd, 0, |
| 249 |
FALSE, DUPLICATE_SAME_ACCESS)) |
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return FALSE; |
| 251 |
CloseHandle(stdoutRdInh); |
| 252 |
|
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return TRUE; |
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} |
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|
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|
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static void |
| 258 |
resetStdHandles( /* clean up our std streams */ |
| 259 |
HANDLE stdoutOrig, |
| 260 |
HANDLE stdinOrig |
| 261 |
) |
| 262 |
{ |
| 263 |
SetStdHandle(STD_OUTPUT_HANDLE, stdoutOrig); |
| 264 |
SetStdHandle(STD_INPUT_HANDLE, stdinOrig); |
| 265 |
} |
| 266 |
|
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|
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static int |
| 269 |
parse_pipes( /* split a shell command pipe sequence */ |
| 270 |
char *s, |
| 271 |
char *lines[], |
| 272 |
char **infn, |
| 273 |
char **outfn, |
| 274 |
int *append, |
| 275 |
int maxl |
| 276 |
) |
| 277 |
{ |
| 278 |
int n = 0, i; |
| 279 |
char *se, *ws; |
| 280 |
char *curs; |
| 281 |
int llen = 0; |
| 282 |
int quote = 0; |
| 283 |
int last = 0; |
| 284 |
|
| 285 |
if (maxl<= 0) return 0; |
| 286 |
if (s == NULL) { |
| 287 |
return 0; |
| 288 |
} |
| 289 |
*infn = *outfn = NULL; |
| 290 |
while (isspace(*s)) s++; /* leading whitespace */ |
| 291 |
se = s; |
| 292 |
while (n < maxl) { |
| 293 |
switch (*se) { |
| 294 |
case '"': |
| 295 |
if (quote == '"') quote = 0; |
| 296 |
else if (quote == 0) quote = '"'; |
| 297 |
break; |
| 298 |
case '\'': |
| 299 |
if (quote == '\'') quote = 0; |
| 300 |
else if (quote == 0) quote = '\''; |
| 301 |
break; |
| 302 |
case '<': |
| 303 |
case '>': |
| 304 |
case '|': |
| 305 |
case '\0': |
| 306 |
if (*se != '\0' && quote) |
| 307 |
break; |
| 308 |
llen = se - s; |
| 309 |
curs = malloc(llen+1); |
| 310 |
strncpy(curs, s, llen); |
| 311 |
/* remove unix style line-end escapes */ |
| 312 |
while((ws = strstr(curs, "\\\n")) != NULL) |
| 313 |
*ws = *(ws+1) = ' '; |
| 314 |
/* remove DOS style line-end escapes */ |
| 315 |
while((ws = strstr(curs, "\\\r\n")) != NULL) |
| 316 |
*ws = *(ws+1) = *(ws+2) = ' '; |
| 317 |
while (isspace(*(curs + llen - 1))) |
| 318 |
llen--; /* trailing whitespace */ |
| 319 |
curs[llen] = '\0'; |
| 320 |
|
| 321 |
if (last == '|' || last == 0) { /* first or pipe */ |
| 322 |
lines[n] = curs; |
| 323 |
n++; |
| 324 |
curs = NULL; |
| 325 |
} else if (last == '<') { /* input file */ |
| 326 |
if (*infn != NULL) { |
| 327 |
eputs("win_popen(): ambiguous input redirection"); |
| 328 |
goto error; |
| 329 |
} |
| 330 |
*infn = curs; |
| 331 |
curs = NULL; |
| 332 |
} else if (last == '>') { /* output file */ |
| 333 |
if (*outfn != NULL) { |
| 334 |
eputs("win_popen(): ambiguous output redirection"); |
| 335 |
goto error; |
| 336 |
} |
| 337 |
*outfn = curs; |
| 338 |
curs = NULL; |
| 339 |
if (*se != '\0' && *se+1 == '>') { /* >> */ |
| 340 |
*append = 1; |
| 341 |
se++; |
| 342 |
} |
| 343 |
} |
| 344 |
last = *se; |
| 345 |
|
| 346 |
if (*se == '\0') return n; |
| 347 |
s = se + 1; |
| 348 |
while (isspace(*s)) s++; /* leading whitespace */ |
| 349 |
se = s; |
| 350 |
break; |
| 351 |
default: |
| 352 |
break; |
| 353 |
} |
| 354 |
se++; |
| 355 |
} |
| 356 |
/* more jobs than slots */ |
| 357 |
error: |
| 358 |
for (i = 0; i < n; i++) free(lines[i]); |
| 359 |
if (*infn != NULL) free(*infn); |
| 360 |
if (*outfn != NULL) free(*outfn); |
| 361 |
if (curs != NULL) free(curs); |
| 362 |
return -1; |
| 363 |
} |
| 364 |
|
| 365 |
|
| 366 |
static BOOL |
| 367 |
runChild( /* start a child process with the right std streams */ |
| 368 |
char* executable, |
| 369 |
char* cmdline, |
| 370 |
HANDLE stdinRd, |
| 371 |
HANDLE stdoutWr, |
| 372 |
HANDLE stderrWr |
| 373 |
) |
| 374 |
{ |
| 375 |
PROCESS_INFORMATION procInfo; |
| 376 |
STARTUPINFO startupInfo; |
| 377 |
|
| 378 |
/* use the given handles and don't display the console window */ |
| 379 |
ZeroMemory(&startupInfo, sizeof(STARTUPINFO)); |
| 380 |
startupInfo.cb = sizeof(STARTUPINFO); |
| 381 |
startupInfo.dwFlags = STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW; |
| 382 |
startupInfo.wShowWindow = SW_HIDE; |
| 383 |
startupInfo.hStdInput = stdinRd; |
| 384 |
startupInfo.hStdOutput = stdoutWr; |
| 385 |
startupInfo.hStdError = stderrWr; |
| 386 |
|
| 387 |
return CreateProcess(executable, cmdline, NULL, NULL, |
| 388 |
TRUE, 0, |
| 389 |
NULL, NULL, &startupInfo, &procInfo); |
| 390 |
} |
| 391 |
|
| 392 |
|
| 393 |
|
