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#if !defined(lint) && !defined(DOS)
static char rcsid[] = "$Id: altedit.c 854 2007-12-07 17:44:43Z hubert@u.washington.edu $";
#endif
/*
* ========================================================================
* Copyright 2006-2007 University of Washington
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* ========================================================================
*/
#include <system.h>
#include <general.h>
#include "../../pith/osdep/pipe.h"
#include "../../pith/osdep/forkwait.h"
#include "../../pith/charconv/filesys.h"
#include "../estruct.h"
#include "../mode.h"
#include "../pico.h"
#include "../edef.h"
#include "../efunc.h"
#include "../keydefs.h"
#include "../utf8stub.h"
#include "tty.h"
#include "filesys.h"
#ifdef _WINDOWS
#include "mswin.h"
#endif
#include "altedit.h"
#ifndef _WINDOWS
#include "signals.h"
#ifdef SIGCHLD
static jmp_buf pico_child_state;
static short pico_child_jmp_ok, pico_child_done;
#endif /* SIGCHLD */
#endif /* !_WINDOWS */
/* internal prototypes */
#ifndef _WINDOWS
#ifdef SIGCHLD
RETSIGTYPE child_handler(int);
#endif /* SIGCHLD */
#else /* _WINDOWS */
int alt_editor_valid(char *, char *, size_t);
int alt_editor_valid_fp(char *);
#endif /* _WINDOWS */
/*
* alt_editor - fork off an alternate editor for mail message composition
* if one is configured and passed from pine. If not, only
* ask for the editor if advanced user flag is set, and
* suggest environment's EDITOR value as default.
*/
int
alt_editor(int f, int n)
{
#ifndef _WINDOWS
char eb[NLINE]; /* buf holding edit command */
char *fn; /* tmp holder for file name */
char result[128]; /* result string */
char prmpt[128];
int i, done = 0, ret = 0, rv, trv;
pid_t child, pid;
RETSIGTYPE (*ohup)(int);
RETSIGTYPE (*oint)(int);
RETSIGTYPE (*osize)(int);
int status;
EML eml;
eml.s = f ? "speller" : "editor";
if(gmode&MDSCUR){
emlwrite("Alternate %s not available in restricted mode", &eml);
return(-1);
}
strncpy(result, "Alternate %s complete.", sizeof(result));
result[sizeof(result)-1] = '\0';
if(f){
if(alt_speller){
strncpy(eb, alt_speller, sizeof(eb));
eb[sizeof(eb)-1] = '\0';
}
else
return(-1);
}
else if(Pmaster == NULL){
return(-1);
}
else{
eb[0] = '\0';
if(Pmaster->alt_ed){
char **lp, *wsp, *path, fname[MAXPATH+1];
int c;
for(lp = Pmaster->alt_ed; *lp && **lp; lp++){
if((wsp = strpbrk(*lp, " \t")) != NULL){
c = *wsp;
*wsp = '\0';
}
if(strchr(*lp, '/')){
rv = fexist(*lp, "x", (off_t *)NULL);
}
else{
if(!(path = getenv("PATH")))
path = ":/bin:/usr/bin";
rv = ~FIOSUC;
while(rv != FIOSUC && *path && pathcat(fname, &path, *lp))
rv = fexist(fname, "x", (off_t *)NULL);
}
if(wsp)
*wsp = c;
if(rv == FIOSUC){
strncpy(eb, *lp, sizeof(eb));
eb[sizeof(eb)-1] = '\0';
break;
}
}
}
if(!eb[0]){
if(!(gmode&MDADVN)){
unknown_command(0);
return(-1);
}
if(getenv("EDITOR")){
strncpy(eb, (char *)getenv("EDITOR"), sizeof(eb));
eb[sizeof(eb)-1] = '\0';
}
else
*eb = '\0';
while(!done){
pid = mlreplyd_utf8("Which alternate editor ? ", eb,
sizeof(eb), QDEFLT, NULL);
switch(pid){
case ABORT:
curwp->w_flag |= WFMODE;
return(-1);
case HELPCH:
emlwrite("no alternate editor help yet", NULL);
/* take sleep and break out after there's help */
sleep(3);
break;
case (CTRL|'L'):
sgarbf = TRUE;
update();
break;
case TRUE:
case FALSE: /* does editor exist ? */
if(*eb == '\0'){ /* leave silently? */
mlerase();
curwp->w_flag |= WFMODE;
return(-1);
}
done++;
break;
default:
break;
}
}
}
}
if((fn=writetmp(1, NULL)) == NULL){ /* get temp file */
emlwrite("Problem writing temp file for alt editor", NULL);
return(-1);
}
strncat(eb, " ", sizeof(eb)-strlen(eb)-1);
eb[sizeof(eb)-1] = '\0';
strncat(eb, fn, sizeof(eb)-strlen(eb)-1);
eb[sizeof(eb)-1] = '\0';
for(i = 0; i <= ((Pmaster) ? term.t_nrow : term.t_nrow - 1); i++){
movecursor(i, 0);
if(!i){
fputs("Invoking alternate ", stdout);
fputs(f ? "speller..." : "editor...", stdout);
}
peeol();
}
(*term.t_flush)();
if(Pmaster)
(*Pmaster->tty_fix)(0);
else
vttidy();
#ifdef SIGCHLD
if(Pmaster){
/*
* The idea here is to keep any mail connections our caller
* may have open while our child's out running around...
*/
pico_child_done = pico_child_jmp_ok = 0;
(void) signal(SIGCHLD, child_handler);
}
#endif
if((child = fork()) > 0){ /* wait for the child to finish */
ohup = signal(SIGHUP, SIG_IGN); /* ignore signals for now */
oint = signal(SIGINT, SIG_IGN);
#if defined(SIGWINCH) && defined(TIOCGWINSZ)
osize = signal(SIGWINCH, SIG_IGN);
#endif
#ifdef SIGCHLD
if(Pmaster){
while(!pico_child_done){
(*Pmaster->newmail)(0, 0);
if(!pico_child_done){
if(setjmp(pico_child_state) == 0){
pico_child_jmp_ok = 1;
sleep(600);
}
else
our_sigunblock(SIGCHLD);
}
pico_child_jmp_ok = 0;
}
}
#endif
trv = process_reap(child, &status, PR_NONE);
signal(SIGHUP, ohup); /* restore signals */
signal(SIGINT, oint);
#if defined(SIGWINCH) && defined(TIOCGWINSZ)
signal(SIGWINCH, osize);
#endif
/*
* Report child's unnatural or unhappy exit...
*/
if(trv > 0 && status == 0){
strncpy(result, "Alternate %s done", sizeof(result));
result[sizeof(result)-1] = '\0';
}
else {
snprintf(result, sizeof(result), "Alternate %%s terminated abnormally (%d)",
(trv == 0) ? status : -1);
if(f)
ret = -1;
else{
snprintf(prmpt, sizeof(prmpt), "Alt editor failed, use file %.20s of size %%ld chars anyway", fn);
ret = -2;
}
}
}
else if(child == 0){ /* spawn editor */
signal(SIGHUP, SIG_DFL); /* let editor handle signals */
signal(SIGINT, SIG_DFL);
#if defined(SIGWINCH) && defined(TIOCGWINSZ)
signal(SIGWINCH, SIG_DFL);
#endif
#ifdef SIGCHLD
(void) signal(SIGCHLD, SIG_DFL);
#endif
if(execl("/bin/sh", "sh", "-c", fname_to_locale(eb), (char *) NULL) < 0)
exit(-1);
}
else { /* error! */
snprintf(result, sizeof(result), "\007Can't fork %%s: %s", errstr(errno));
ret = -1;
}
#ifdef SIGCHLD
(void) signal(SIGCHLD, SIG_DFL);
#endif
if(Pmaster)
(*Pmaster->tty_fix)(1);
/*
* replace edited text with new text
*/
curbp->b_flag &= ~BFCHG; /* make sure old text gets blasted */
if(ret == -2){
off_t filesize;
char prompt[128];
rv = fexist(fn, "r", &filesize);
if(rv == FIOSUC && filesize > 0){
snprintf(prompt, sizeof(prompt), prmpt, (long) filesize);
/* clear bottom 3 rows */
pclear(term.t_nrow-2, term.t_nrow);
i = mlyesno_utf8(prompt, FALSE);
if(i == TRUE){
ret = 0;
strncpy(result, "OK, alternate %s done", sizeof(result));
result[sizeof(result)-1] = '\0';
}
else
ret = -1;
}
else
ret = -1;
}
if(ret == 0)
readin(fn, 0, 0); /* read new text overwriting old */
our_unlink(fn); /* blast temp file */
curbp->b_flag |= BFCHG; /* mark dirty for packbuf() */
ttopen(); /* reset the signals */
pico_refresh(0, 1); /* redraw */
update();
emlwrite(result, &eml);
return(ret);
#else /* _WINDOWS */
char eb[2 * PATH_MAX]; /* buf holding edit command */
char *fn; /* tmp holder for file name */
char errbuf[128];
char **lp;
int status;
int done;
int rc;
if(Pmaster == NULL)
return(-1);
if(gmode&MDSCUR){
emlwrite("Alternate editor not available in restricted mode", NULL);
return(-1);
}
eb[0] = '\0';
if(Pmaster->alt_ed){
char *p;
for(lp = Pmaster->alt_ed; *lp && **lp; lp++)
if(*lp[0] == '\"'){
if(p = strchr(*lp + 1, '\"')){
*p = '\0';
rc = alt_editor_valid((*lp) + 1, eb, sizeof(eb));
*p = '\"';
if(rc){
strncat(eb, p + 1, sizeof(eb)-strlen(eb)-1);
eb[sizeof(eb)-1] = '\0';
break;
}
}
}
else if(p = strchr(*lp, ' ')){
for(rc = 0; !rc; ){
if(p)
*p = '\0';
rc = alt_editor_valid(*lp, eb, sizeof(eb));
if(p)
*p = ' ';
if(rc){
if(p){
strncat(eb, p, sizeof(eb)-strlen(eb)-1);
eb[sizeof(eb)-1] = '\0';
}
break;
}
else if(p)
p = strchr(p + 1, ' ');
else
break;
}
if(rc)
break;
}
else if(alt_editor_valid(*lp, eb, sizeof(eb)))
break;
}
if(!eb[0]){
if(!(gmode&MDADVN)){
unknown_command(0);
return(-1);
}
/* Guess which editor they want. */
if(getenv("EDITOR")){
strncpy(eb, (char *)getenv("EDITOR"), sizeof(eb));
eb[sizeof(eb)-1] = '\0';
}
else
*eb = '\0';
done = FALSE;
while(!done){
rc = mlreplyd_utf8("Which alternate editor ? ", eb,
sizeof(eb),QDEFLT,NULL);
switch(rc){
case ABORT:
curwp->w_flag |= WFMODE;
return(-1);
case HELPCH:
emlwrite("no alternate editor help yet", NULL);
/* take sleep and break out after there's help */
sleep(3);
break;
case (CTRL|'L'):
sgarbf = TRUE;
update();
break;
case TRUE:
case FALSE: /* does editor exist ? */
if(*eb == '\0'){ /* leave silently? */
mlerase();
curwp->w_flag |= WFMODE;
return(-1);
}
done++;
break;
default:
break;
}
}
}
if((fn=writetmp(1, NULL)) == NULL){ /* get temp file */
emlwrite("Problem writing temp file for alt editor", NULL);
return(-1);
}
emlwrite("Waiting for alternate editor to finish...", NULL);
#ifdef ALTED_DOT
if(eb[0] == '.' && eb[1] == '\0') {
status = mswin_exec_and_wait ("alternate editor", eb, fn, fn,
NULL, 0);
}
else
#endif /* ALTED_DOT */
{ /* just here in case ALTED_DOT is defined */
strncat(eb, " ", sizeof(eb)-strlen(eb)-1);
eb[sizeof(eb)-1] = '\0';
strncat(eb, fn, sizeof(eb)-strlen(eb)-1);
eb[sizeof(eb)-1] = '\0';
status = mswin_exec_and_wait ("alternate editor", eb, NULL, NULL,
NULL, 0);
}
switch (status) {
case 0:
/*
* Success: replace edited text with new text
*/
curbp->b_flag &= ~BFCHG; /* make sure old text gets blasted */
readin(fn, 0, 0); /* read new text overwriting old */
our_unlink(fn); /* blast temp file */
curbp->b_flag |= BFCHG; /* mark dirty for packbuf() */
ttopen(); /* reset the signals */
pico_refresh(0, 1); /* redraw */
return(0);
/*
* Possible errors.
*/
case -1:
/* Failed to map return from WinExec to a HTASK. */
emlwrite("Problem finding alternate editor task handle.", NULL);
return (-1);
case -2:
/* User decided to abandon the alternate editor.*/
emlwrite("Alternate editor abandoned.", NULL);
return (-1);
default:
mswin_exec_err_msg ("alternate editor", status, errbuf, sizeof(errbuf));
emlwrite (errbuf, NULL);
return (-1);
}
return (-1);
#endif /*_WINDOWS */
}
#ifndef _WINDOWS
int
pathcat(char *buf, char **path, char *file)
{
register int n = 0;
while(**path && **path != ':'){
if(n++ > MAXPATH)
return(FALSE);
*buf++ = *(*path)++;
}
if(n){
if(n++ > MAXPATH)
return(FALSE);
*buf++ = '/';
}
while((*buf = *file++) != '\0'){
if(n++ > MAXPATH)
return(FALSE);
buf++;
}
if(**path == ':')
(*path)++;
return(TRUE);
}
#ifdef SIGCHLD
/*
* child_handler - handle child status change signal
*/
RETSIGTYPE
child_handler(int sig)
{
pico_child_done = 1;
if(pico_child_jmp_ok){
#ifdef sco
/*
* Villy Kruse <vek@twincom.nl> says:
* This probably only affects older unix systems with a "broken" sleep
* function such as AT&T System V rel 3.2 and systems derived from
* that version. The problem is that the sleep function on these
* versions of unix will set up a signal handler for SIGALRM which
* will longjmp into the sleep function when the alarm goes off.
* This gives problems if another signal handler longjmps out of the
* sleep function, thus making the stack frame for the signal function
* invalid, and when the ALARM handler later longjmps back into the
* sleep function it does no longer have a valid stack frame.
* My sugested fix is to cancel the pending alarm in the SIGCHLD
* handler before longjmp'ing. This shouldn't hurt as there
* shouldn't be any ALARM pending at this point except possibly from
* the sleep call.
*
*
* [Even though it shouldn't hurt, we'll make it sco-specific for now.]
*
*
* The sleep call might have set up a signal handler which would
* longjmp back into the sleep code, and that would cause a crash.
*/
signal(SIGALRM, SIG_IGN); /* Cancel signal handeler */
alarm(0); /* might longjmp back into sleep */
#endif
longjmp(pico_child_state, 1);
}
}
#endif /* SIGCHLD */
#else /* _WINDOWS */
/*
* alt_editor_valid -- test the given exe name exists, and if so
* return full name in "cmdbuf".
*/
int
alt_editor_valid(char *exe, char *cmdbuf, size_t ncmdbuf)
{
/****
**** This isn't the right way to do this. I believe we
**** should be doing all of this in TCHARs starting in
**** the alt_editor function instead of trying to convert
**** to char * here.
****/
if(!exe)
return(FALSE);
#ifdef ALTED_DOT
if(exe[0] == '.' && exe[1] == '\0') {
cmdbuf[0] = '.';
cmdbuf[1] = '\0';
return(TRUE);
}
else
#endif /* ALTED_DOT */
if((isalpha((unsigned char) *exe) && *exe == ':') || strchr(exe, '\\')){
char *path;
if(alt_editor_valid_fp(path = exe)){
if(strchr(path, ' '))
snprintf(cmdbuf, ncmdbuf, "\"%s\"", path);
else{
strncpy(cmdbuf, path, ncmdbuf);
cmdbuf[ncmdbuf-1] = '\0';
}
return(TRUE);
}
}
else{
TCHAR pathbuflpt[PATH_MAX+1];
LPTSTR name, exelpt;
LPTSTR cmdbuflpt;
char *utf8;
cmdbuflpt = (LPTSTR) MemAlloc(ncmdbuf * sizeof(TCHAR));
cmdbuflpt[0] = L'0';
exelpt = utf8_to_lptstr(exe);
if(SearchPath(NULL, exelpt, NULL, PATH_MAX+1, pathbuflpt, &name)){
if(_tcschr(pathbuflpt, L' '))
_stprintf_s(cmdbuflpt, ncmdbuf, TEXT("\"%s\""), pathbuflpt);
else
_stprintf_s(cmdbuflpt, ncmdbuf, TEXT("%s"), pathbuflpt);
if(exelpt)
fs_give((void **) &exelpt);
utf8 = lptstr_to_utf8(cmdbuflpt);
if(utf8){
strncpy(cmdbuf, utf8, ncmdbuf);
cmdbuf[ncmdbuf-1] = '\0';
fs_give((void **) &utf8);
}
if(cmdbuflpt)
MemFree((void *) cmdbuflpt);
return(TRUE);
}
if(exelpt)
fs_give((void **) &exelpt);
if(cmdbuflpt)
MemFree((void *) cmdbuflpt);
}
return(FALSE);
}
/*
* alt_editor_valid_fp -- test the given full path name exists
*/
int
alt_editor_valid_fp(path)
char *path;
{
static char *exts[] = {".exe", ".com", ".bat", NULL};
char pathcopy[PATH_MAX + 1], *dot = NULL;
int i, j;
for(i = 0; pathcopy[i] = path[i]; i++)
if(path[i] == '.')
dot = &path[i];
if(dot && (!strucmp(dot, ".exe")
|| !strucmp(dot, ".com") || !strucmp(dot, ".bat"))){
if(fexist(path, "x", (off_t *) NULL) == FIOSUC)
return(TRUE);
}
else{
for(j = 0; exts[j]; j++){
strncpy(&pathcopy[i], exts[j], sizeof(pathcopy)-i);
pathcopy[sizeof(pathcopy)-1] = '\0';
if(fexist(pathcopy, "x", (off_t *) NULL) == FIOSUC)
return(TRUE);
}
}
return(FALSE);
}
#endif
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