usr/src/bin/sh/histedit.c

/*
 * Editline and history functions (and glue).
 */
#include <stdio.h>
#include "parser.h"
#include "options.h"
#include "error.h"

#include "histedit.h"

History *hist;  /* history cookie */
EditLine *el;   /* editline cookie */
static FILE *el_in, *el_out;

extern int is_interactive;

/*
 * Set history and editing status.  Called whenever the status may
 * have changed (figures out what to do).
 */
histedit() {

        if (is_interactive) {
                if (!hist) {
                        /*
                         * turn history on
                         */
                        INTOFF;
                        hist = history_init();
                        INTON;

                        if (hist != NULL)
                                sethistsize();
                        else
                                out2str("sh: can't initialize history\n");
                }
                if (Eflag && !el && isatty(0)) { /* && isatty(2) ??? */
                        /*
                         * turn editing on
                         */
                        INTOFF;
                        if (el_in == NULL)
                                el_in = fdopen(0, "r");
                        if (el_out == NULL)
                                el_out = fdopen(2, "w");
                        if (el_in == NULL || el_out == NULL)
                                goto bad;
                        el = el_init(arg0, el_in, el_out);
                        if (el != NULL) {
                                if (hist)
                                        el_set(el, EL_HIST, history_set, hist);
                                el_set(el, EL_PROMPT, getprompt);
                        } else {
bad:
                                out2str("sh: can't initialize editing\n");
                        }
                        INTON;
                        if (el) /* XXX - -o vi etc... */
                                el_set(el, EL_EDITOR, "vi");
                } else if (!Eflag && el) {
                        INTOFF;
                        el_end(el);
                        el = NULL;
                        INTON;
                }
        } else {
                INTOFF;
                if (el) {       /* no editing if not interactive */
                        el_end(el);
                        el = NULL;
                }
                if (hist) {
                        history_end(hist);
                        hist = NULL;
                }
                INTON;
        }
}

sethistsize() {
        char *cp;
        int histsize;

        if (hist != NULL) {
                cp = lookupvar("HISTSIZE");
                if (cp == NULL || *cp == '\0' ||
                   (histsize = atoi(cp)) < 0)
                        histsize = 100;
                history_set(hist, H_EVENT, histsize);
        }
}