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/* read_switch_multiword.c -- get an answer from the user and return a string array
*
* This code is Copyright (c) 2002, by the authors of nmh. See the
* COPYRIGHT file in the root directory of the nmh distribution for
* complete copyright information.
*/
#include "h/mh.h"
#include "read_switch_multiword.h"
#include "smatch.h"
#include "brkstring.h"
#include "ambigsw.h"
#include "print_sw.h"
#include <signal.h>
#include "signals.h"
#include <setjmp.h>
static char ansbuf[BUFSIZ];
static sigjmp_buf sigenv;
/*
* static prototypes
*/
static void intrser (int);
char **
read_switch_multiword (const char *prompt, const struct swit *ansp)
{
int i;
SIGNAL_HANDLER istat = NULL;
char *cp, **cpp;
if (sigsetjmp(sigenv, 1)) {
SIGNAL (SIGINT, istat);
return NULL;
}
istat = SIGNAL (SIGINT, intrser);
for (;;) {
fputs(prompt, stdout);
fflush (stdout);
cp = ansbuf;
while ((i = getchar ()) != '\n') {
if (i == EOF) {
/*
* If we get an EOF, return
*/
if (feof(stdin))
siglongjmp (sigenv, 1);
/*
* For errors, if we get an EINTR that means that we got
* a signal and we should retry. If we get another error,
* then just return.
*/
if (ferror(stdin)) {
if (errno == EINTR) {
clearerr(stdin);
continue;
}
fprintf(stderr, "\nError %s during read\n",
strerror(errno));
siglongjmp (sigenv, 1);
}
/* Just for completeness's sake... */
fprintf(stderr, "\nUnknown problem in getchar()\n");
siglongjmp(sigenv, 1);
}
if (cp < &ansbuf[sizeof ansbuf - 1])
*cp++ = i;
}
*cp = '\0';
if (ansbuf[0] == '?' || cp == ansbuf) {
puts("Options are:");
print_sw("", ansp, "", stdout);
continue;
}
cpp = brkstring (ansbuf, " ", NULL);
switch (smatch (*cpp, ansp)) {
case AMBIGSW:
ambigsw (*cpp, ansp);
continue;
case UNKWNSW:
printf (" -%s unknown. Hit <CR> for help.\n", *cpp);
continue;
default:
SIGNAL (SIGINT, istat);
return cpp;
}
}
}
static void
intrser (int i)
{
NMH_UNUSED (i);
siglongjmp (sigenv, 1);
}
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