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/*
* getans.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 <h/signals.h>
#include <setjmp.h>
static char ansbuf[BUFSIZ];
static sigjmp_buf sigenv;
/*
* static prototypes
*/
static void intrser (int);
char **
getans (char *prompt, struct swit *ansp)
{
int i;
SIGNAL_HANDLER istat = NULL;
char *cp, **cpp;
if (!(sigsetjmp(sigenv, 1))) {
istat = SIGNAL (SIGINT, intrser);
} else {
SIGNAL (SIGINT, istat);
return NULL;
}
for (;;) {
printf ("%s", prompt);
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.
*/
else if (ferror(stdin)) {
if (errno == EINTR) {
clearerr(stdin);
continue;
}
fprintf(stderr, "\nError %s during read\n",
strerror(errno));
siglongjmp (sigenv, 1);
} else {
/*
* 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) {
printf ("Options are:\n");
print_sw (ALL, 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);
/*
* should this be siglongjmp?
*/
siglongjmp (sigenv, 1);
}
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