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120 lines
3.0 KiB
C
120 lines
3.0 KiB
C
/***********************************************************
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Copyright 1991, 1992, 1993 by Stichting Mathematisch Centrum,
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Amsterdam, The Netherlands.
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and its
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documentation for any purpose and without fee is hereby granted,
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provided that the above copyright notice appear in all copies and that
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both that copyright notice and this permission notice appear in
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supporting documentation, and that the names of Stichting Mathematisch
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Centrum or CWI not be used in advertising or publicity pertaining to
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distribution of the software without specific, written prior permission.
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STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
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THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
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FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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******************************************************************/
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/* Readline interface for tokenizer.c.
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By default, we have a super simple my_readline function.
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Optionally, we can use the GNU readline library (to be found in the
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bash distribution).
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my_readline() has a different return value from GNU readline():
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- NULL if an interrupt occurred or if an error occurred
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- a malloc'ed empty string if EOF was read
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- a malloc'ed string ending in \n normally
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*/
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#include <stdio.h>
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#include <string.h>
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#include "mymalloc.h"
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#ifdef HAVE_READLINE
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extern char *readline();
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#include <setjmp.h>
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#include <signal.h>
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static jmp_buf jbuf;
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/* ARGSUSED */
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static RETSIGTYPE
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onintr(sig)
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int sig;
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{
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longjmp(jbuf, 1);
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}
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#endif /* HAVE_READLINE */
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char *
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my_readline(prompt)
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char *prompt;
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{
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int n;
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char *p;
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#ifdef HAVE_READLINE
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RETSIGTYPE (*old_inthandler)();
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static int been_here;
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if (!been_here) {
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/* Force rebind of TAB to insert-tab */
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extern int rl_insert();
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rl_bind_key('\t', rl_insert);
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been_here++;
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}
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old_inthandler = signal(SIGINT, onintr);
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if (setjmp(jbuf)) {
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signal(SIGINT, old_inthandler);
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return NULL;
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}
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p = readline(prompt);
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signal(SIGINT, old_inthandler);
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if (p == NULL) {
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p = malloc(1);
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if (p != NULL)
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*p = '\0';
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return p;
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}
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n = strlen(p);
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if (n > 0)
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add_history(p);
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if ((p = realloc(p, n+2)) != NULL) {
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p[n] = '\n';
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p[n+1] = '\0';
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}
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return p;
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#else /* !HAVE_READLINE */
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n = 100;
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if ((p = malloc(n)) == NULL)
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return NULL;
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if (prompt)
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fprintf(stderr, "%s", prompt);
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if (fgets(p, n, stdin) == NULL)
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*p = '\0';
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if (intrcheck()) {
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free(p);
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return NULL;
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}
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n = strlen(p);
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while (n > 0 && p[n-1] != '\n') {
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int incr = n+2;
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p = realloc(p, n + incr);
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if (p == NULL)
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return NULL;
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if (fgets(p+n, incr, stdin) == NULL)
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break;
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n += strlen(p+n);
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}
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return realloc(p, n+1);
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#endif /* !HAVE_READLINE */
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}
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