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bool
do_exec(cmd)
char *cmd;
{
register char **a;
register char *s;
char flags[10];
/* save an extra exec if possible */
#ifdef CSH
if (strnEQ(cmd,cshname,cshlen) && strnEQ(cmd+cshlen," -c",3)) {
strcpy(flags,"-c");
s = cmd+cshlen+3;
if (*s == 'f') {
s++;
strcat(flags,"f");
}
if (*s == ' ')
s++;
if (*s++ == '\'') {
char *ncmd = s;
while (*s)
s++;
if (s[-1] == '\n')
*--s = '\0';
if (s[-1] == '\'') {
*--s = '\0';
execl(cshname,"csh", flags,ncmd,(char*)0);
*s = '\'';
return FALSE;
}
}
}
#endif /* CSH */
/* see if there are shell metacharacters in it */
/*SUPPRESS 530*/
for (s = cmd; *s && isALPHA(*s); s++) ; /* catch VAR=val gizmo */
if (*s == '=')
goto doshell;
for (s = cmd; *s; s++) {
if (*s != ' ' && !isALPHA(*s) && index("$&*(){}[]'\";\\|?<>~`\n",*s)) {
if (*s == '\n' && !s[1]) {
*s = '\0';
break;
}
doshell:
execl("/bin/sh","sh","-c",cmd,(char*)0);
return FALSE;
}
}
New(402,Argv, (s - cmd) / 2 + 2, char*);
Cmd = nsavestr(cmd, s-cmd);
a = Argv;
for (s = Cmd; *s;) {
while (*s && isSPACE(*s)) s++;
if (*s)
*(a++) = s;
while (*s && !isSPACE(*s)) s++;
if (*s)
*s++ = '\0';
}
*a = Nullch;
if (Argv[0]) {
execvp(Argv[0],Argv);
if (errno == ENOEXEC) { /* for system V NIH syndrome */
do_execfree();
goto doshell;
}
}
do_execfree();
return FALSE;
}
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