152 lines
4.3 KiB
C
152 lines
4.3 KiB
C
/* vms-code.c -- additional VMS-specific support code for flex
|
||
*/
|
||
|
||
#include "flexdef.h"
|
||
|
||
static const char *original_arg0;
|
||
static const char default_arg0[] = "flex.exe";
|
||
|
||
#define IN_FD 0
|
||
#define OUT_FD 1
|
||
#define ERR_FD 2
|
||
|
||
static char *fix_arg0 PROTO((const char *));
|
||
|
||
/* Command line arguments fixup -- simplify argv[0], and handle `>'
|
||
output redirection request; called first thing from main(). */
|
||
|
||
void argv_fixup( iargc, iargv )
|
||
int *iargc;
|
||
char ***iargv;
|
||
{
|
||
const char *mode[3], *rfm[3], *name[3];
|
||
char *p;
|
||
int i, oargc, punct, which, append, alt_rfm;
|
||
|
||
/*
|
||
* Get original argv[0] supplied by run-time library startup code,
|
||
* then replace it with a stripped down one.
|
||
*/
|
||
original_arg0 = (*iargv)[0];
|
||
(*iargv)[0] = fix_arg0(original_arg0);
|
||
|
||
/*
|
||
* Check command line arguments for redirection request(s).
|
||
* For simplicity, if multiple attempts are made, the last one wins.
|
||
*/
|
||
name[0] = name[1] = name[2] = 0;
|
||
oargc = 1; /* number of args caller will see; count includes argv[0] */
|
||
for (i = 1; i < *iargc; i++) {
|
||
p = (*iargv)[i];
|
||
switch (*p) {
|
||
case '<':
|
||
/* might be "<dir>file"; then again, perhaps "<<dir>file" */
|
||
punct = (strchr(p, '>') != 0);
|
||
if (p[1] == '<') {
|
||
if (!punct || p[2] == '<')
|
||
flexerror("<<'sentinel' input not supported.");
|
||
punct = 0;
|
||
}
|
||
if (punct) /* the '<' seems to be directory punctuation */
|
||
goto arg; /*GOTO*/
|
||
mode[IN_FD] = "r";
|
||
rfm[IN_FD] = 0;
|
||
name[IN_FD] = ++p;
|
||
if (!*p && (i + 1) < *iargc)
|
||
name[IN_FD] = (*iargv)[++i];
|
||
break;
|
||
case '>':
|
||
append = (p[1] == '>');
|
||
if (append) ++p;
|
||
alt_rfm = (p[1] == '$');
|
||
if (alt_rfm) ++p;
|
||
which = (p[1] == '&' ? ERR_FD : OUT_FD);
|
||
if (which == ERR_FD) ++p;
|
||
mode[which] = append ? "a" : "w";
|
||
rfm[which] = alt_rfm ? "rfm=var" : "rfm=stmlf";
|
||
name[which] = ++p;
|
||
if (!*p && (i + 1) < *iargc)
|
||
name[which] = (*iargv)[++i];
|
||
break;
|
||
case '|':
|
||
flexerror("pipe output not supported.");
|
||
/*NOTREACHED*/
|
||
break;
|
||
default:
|
||
arg: /* ordinary option or argument */
|
||
(*iargv)[oargc++] = p;
|
||
break;
|
||
}
|
||
}
|
||
/* perform any requested redirection; don't bother with SYS$xxx logicals */
|
||
if (name[IN_FD])
|
||
if (!freopen(name[IN_FD], mode[IN_FD], stdin))
|
||
lerrsf("failed to redirect `stdin' from \"%s\"", name[IN_FD]);
|
||
if (name[OUT_FD])
|
||
if (!freopen(name[OUT_FD], mode[OUT_FD], stdout,
|
||
rfm[OUT_FD], "rat=cr", "mbc=32", "shr=nil"))
|
||
lerrsf("failed to redirect `stdout' to \"%s\"", name[OUT_FD]);
|
||
if (name[ERR_FD]) /* likely won't see message if this fails; oh well... */
|
||
if (!freopen(name[ERR_FD], mode[ERR_FD], stderr,
|
||
rfm[ERR_FD], "rat=cr"))
|
||
lerrsf("failed to redirect `stderr' to \"%s\"", name[ERR_FD]);
|
||
/* remove any excess arguments (used up from redirection) */
|
||
while (*iargc > oargc)
|
||
(*iargv)[--*iargc] = 0;
|
||
/* all done */
|
||
return;
|
||
}
|
||
|
||
/* Pick out the basename of a full filename, and return a pointer
|
||
to a modifiable copy of it. */
|
||
|
||
static char *fix_arg0( arg0 )
|
||
const char *arg0;
|
||
{
|
||
char *p, *new_arg0;
|
||
|
||
if (arg0) {
|
||
/* strip off the path */
|
||
if ((p = strrchr(arg0, ':')) != 0) /* device punctuation */
|
||
arg0 = p + 1;
|
||
if ((p = strrchr(arg0, ']')) != 0) /* directory punctuation */
|
||
arg0 = p + 1;
|
||
if ((p = strrchr(arg0, '>')) != 0) /* alternate dir punct */
|
||
arg0 = p + 1;
|
||
}
|
||
if (!arg0 || !*arg0)
|
||
arg0 = default_arg0;
|
||
/* should now have "something.exe;#"; make a modifiable copy */
|
||
new_arg0 = copy_string(arg0);
|
||
|
||
/* strip off ".exe" and/or ";#" (version number),
|
||
unless it ended up as the whole name */
|
||
if ((p = strchr(new_arg0, '.')) != 0 && (p > new_arg0)
|
||
&& (p[1] == 'e' || p[1] == 'E')
|
||
&& (p[2] == 'x' || p[2] == 'X')
|
||
&& (p[3] == 'e' || p[3] == 'E')
|
||
&& (p[4] == ';' || p[4] == '.' || p[4] == '\0'))
|
||
*p = '\0';
|
||
else if ((p = strchr(new_arg0, ';')) != 0 && (p > new_arg0))
|
||
*p = '\0';
|
||
|
||
return new_arg0;
|
||
}
|
||
|
||
|
||
#include <ssdef.h>
|
||
#include <stsdef.h>
|
||
|
||
#ifdef exit
|
||
#undef exit
|
||
extern void exit PROTO((int)); /* <stdlib.h> ended up prototyping vms_exit */
|
||
#endif
|
||
|
||
/* Convert zero to VMS success and non-zero to VMS failure. The latter
|
||
does not bother trying to distinguish between various failure reasons. */
|
||
|
||
void vms_exit( status )
|
||
int status;
|
||
{
|
||
exit( status == 0 ? SS$_NORMAL : (SS$_ABORT | STS$M_INHIB_MSG) );
|
||
}
|