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4d0d726e1d
Author | SHA1 | Date |
---|---|---|
Mid Favila | 4d0d726e1d | |
Hugh Barney | 1d945d0390 | |
Hugh Barney | a763bd8c65 | |
Hugh Barney | 1d1d1b5ef0 | |
Hugh Barney | 6f8d31577e |
158
zep.c
158
zep.c
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@ -1,24 +1,17 @@
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/* zep.c, Zep Emacs, Public Domain, Hugh Barney, 2017, Derived from: Anthony's Editor January 93 */
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#include <stdlib.h>
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#include <stdarg.h>
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#include <assert.h>
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#include <curses.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <sys/ioctl.h>
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#include <ctype.h>
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#include <limits.h>
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#include <string.h>
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#include <unistd.h>
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#include <termios.h>
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#define E_NAME "zep"
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#define E_VERSION "v1.3"
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#define E_VERSION "v1.6"
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#define E_LABEL "Zep:"
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#define B_MODIFIED 0x01 /* modified buffer */
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#define MSGLINE (LINES-1)
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#define CHUNK 8096L
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#define K_BUFFER_LENGTH 256
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@ -52,15 +45,14 @@ typedef struct buffer_t
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int b_row; /* cursor row */
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int b_col; /* cursor col */
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char b_fname[MAX_FNAME + 1]; /* filename */
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char b_flags; /* buffer flags */
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char b_modified; /* was modified */
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} buffer_t;
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/*
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* Some compilers define size_t as a unsigned 16 bit number while
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* point_t and off_t might be defined as a signed 32 bit number.
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* malloc(), realloc(), fread(), and fwrite() take size_t parameters,
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* which means there will be some size limits because size_t is too
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* small of a type.
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* Some compilers define size_t as a unsigned 16 bit number while point_t and
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* off_t might be defined as a signed 32 bit number. malloc(), realloc(),
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* fread(), and fwrite() take size_t parameters, which means there will be some
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* size limits because size_t is too small of a type.
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*/
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#define MAX_SIZE_T ((unsigned long) (size_t) ~0)
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@ -68,7 +60,6 @@ int done;
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char_t *input;
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int msgflag;
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char msgline[TEMPBUF];
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char temp[TEMPBUF];
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keymap_t *key_return;
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keymap_t *key_map;
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buffer_t *curbp;
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@ -80,11 +71,11 @@ buffer_t* new_buffer()
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{
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buffer_t *bp = (buffer_t *)malloc(sizeof(buffer_t));
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assert(bp != NULL);
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bp->b_point = 0;
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bp->b_mark = NOMARK;
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bp->b_page = 0;
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bp->b_epage = 0;
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bp->b_flags = 0;
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bp->b_modified = 0;
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bp->b_buf = NULL;
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bp->b_ebuf = NULL;
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bp->b_gap = NULL;
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@ -97,21 +88,20 @@ buffer_t* new_buffer()
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void fatal(char *msg)
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{
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move(LINES-1, 0);
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refresh();
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noraw();
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endwin();
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printf("\n" E_NAME " " E_VERSION ": %s\n", msg);
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exit(1);
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}
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void msg(char *msg, ...)
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int msg(char *msg, ...)
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{
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va_list args;
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va_start(args, msg);
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(void)vsprintf(msgline, msg, args);
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va_end(args);
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msgflag = TRUE;
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return FALSE;
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}
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/* Given a buffer offset, convert it to a pointer into the buffer */
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@ -133,11 +123,9 @@ int growgap(buffer_t *bp, point_t n)
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{
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char_t *new;
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point_t buflen, newlen, xgap, xegap;
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assert(bp->b_buf <= bp->b_gap);
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assert(bp->b_gap <= bp->b_egap);
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assert(bp->b_egap <= bp->b_ebuf);
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xgap = bp->b_gap - bp->b_buf;
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xegap = bp->b_egap - bp->b_buf;
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buflen = bp->b_ebuf - bp->b_buf;
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@ -147,24 +135,16 @@ int growgap(buffer_t *bp, point_t n)
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newlen = buflen + n * sizeof (char_t);
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if (buflen == 0) {
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if (newlen < 0 || MAX_SIZE_T < newlen) fatal("Failed to allocate required memory.\n");
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if (newlen < 0 || MAX_SIZE_T < newlen) fatal("Failed to allocate required memory");
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new = (char_t*) malloc((size_t) newlen);
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if (new == NULL) fatal("Failed to allocate required memory.\n");
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if (new == NULL) fatal("Failed to allocate required memory");
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} else {
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if (newlen < 0 || MAX_SIZE_T < newlen) {
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msg("Failed to allocate required memory");
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return (FALSE);
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}
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if (newlen < 0 || MAX_SIZE_T < newlen) return msg("Failed to allocate required memory");
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new = (char_t*) realloc(bp->b_buf, (size_t) newlen);
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if (new == NULL) {
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msg("Failed to allocate required memory"); /* Report non-fatal error. */
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return (FALSE);
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}
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if (new == NULL) return msg("Failed to allocate required memory");
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}
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/* Relocate pointers in new buffer and append the new
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* extension to the end of the gap.
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*/
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/* Relocate pointers in new buffer and append the new extension to the end of the gap */
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bp->b_buf = new;
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bp->b_gap = bp->b_buf + xgap;
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bp->b_ebuf = bp->b_buf + buflen;
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@ -197,7 +177,6 @@ void save()
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{
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FILE *fp;
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point_t length;
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fp = fopen(curbp->b_fname, "w");
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if (fp == NULL) msg("Failed to open file \"%s\".", curbp->b_fname);
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(void) movegap(curbp, (point_t) 0);
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@ -205,39 +184,25 @@ void save()
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if (fwrite(curbp->b_egap, sizeof (char), (size_t) length, fp) != length)
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msg("Failed to write file \"%s\".", curbp->b_fname);
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fclose(fp);
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curbp->b_flags &= ~B_MODIFIED;
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curbp->b_modified = 0;
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msg("File \"%s\" %ld bytes saved.", curbp->b_fname, pos(curbp, curbp->b_ebuf));
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}
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/* reads file into buffer at point */
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int insert_file(char *fn, int modflag)
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int insert_file(char *fn)
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{
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FILE *fp;
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size_t len;
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struct stat sb;
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if (stat(fn, &sb) < 0) {
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msg("Failed to find file \"%s\".", fn);
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return (FALSE);
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}
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if (MAX_SIZE_T < sb.st_size) {
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msg("File \"%s\" is too big to load.", fn);
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return (FALSE);
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}
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if (stat(fn, &sb) < 0) return msg("Failed to find file \"%s\".", fn);
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if (MAX_SIZE_T < sb.st_size) return msg("File \"%s\" is too big to load.", fn);
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if (curbp->b_egap - curbp->b_gap < sb.st_size * sizeof (char_t) && !growgap(curbp, sb.st_size))
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return (FALSE);
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if ((fp = fopen(fn, "r")) == NULL) {
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msg("Failed to open file \"%s\".", fn);
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return (FALSE);
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}
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if ((fp = fopen(fn, "r")) == NULL) return msg("Failed to open file \"%s\".", fn);
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curbp->b_point = movegap(curbp, curbp->b_point);
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curbp->b_gap += len = fread(curbp->b_gap, sizeof (char), (size_t) sb.st_size, fp);
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if (fclose(fp) != 0) {
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msg("Failed to close file \"%s\".", fn);
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return (FALSE);
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}
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curbp->b_flags &= (modflag ? B_MODIFIED : ~B_MODIFIED);
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if (fclose(fp) != 0) return msg("Failed to close file \"%s\".", fn);
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msg("File \"%s\" %ld bytes read.", fn, len);
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return (TRUE);
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}
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@ -248,7 +213,6 @@ char_t *get_key(keymap_t *keys, keymap_t **key_return)
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int submatch;
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static char_t buffer[K_BUFFER_LENGTH];
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static char_t *record = buffer;
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*key_return = NULL;
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/* if recorded bytes remain, return next recorded byte. */
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@ -256,19 +220,16 @@ char_t *get_key(keymap_t *keys, keymap_t **key_return)
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*key_return = NULL;
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return record++;
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}
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/* reset record buffer. */
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record = buffer;
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record = buffer; /* reset record buffer. */
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do {
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assert(K_BUFFER_LENGTH > record - buffer);
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/* read and record one byte. */
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*record++ = (unsigned)getch();
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*record++ = (unsigned)getch(); /* read and record one byte. */
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*record = '\0';
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/* if recorded bytes match any multi-byte sequence... */
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for (k = keys, submatch = 0; k->key_bytes != NULL; ++k) {
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char_t *p, *q;
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for (p = buffer, q = (char_t *)k->key_bytes; *p == *q; ++p, ++q) {
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/* an exact match */
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if (*q == '\0' && *p == '\0') {
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@ -279,9 +240,7 @@ char_t *get_key(keymap_t *keys, keymap_t **key_return)
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}
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}
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/* record bytes match part of a command sequence */
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if (*p == '\0' && *q != '\0') {
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submatch = 1;
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}
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if (*p == '\0' && *q != '\0') submatch = 1;
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}
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} while (submatch);
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/* nothing matched, return recorded bytes. */
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@ -310,7 +269,7 @@ point_t segstart(buffer_t *bp, point_t start, point_t finish)
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p = ptr(bp, scan);
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if (*p == '\n') {
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c = 0;
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start = scan+1;
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start = scan + 1;
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} else if (COLS <= c) {
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c = 0;
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start = scan;
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@ -330,11 +289,9 @@ point_t segnext(buffer_t *bp, point_t start, point_t finish)
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point_t scan = segstart(bp, start, finish);
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for (;;) {
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p = ptr(bp, scan);
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if (bp->b_ebuf <= p || COLS <= c)
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break;
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if (bp->b_ebuf <= p || COLS <= c) break;
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++scan;
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if (*p == '\n')
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break;
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if (*p == '\n') break;
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c += *p == '\t' ? 8 - (c & 7) : 1;
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}
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return (p < bp->b_ebuf ? scan : pos(bp, bp->b_ebuf));
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@ -353,10 +310,7 @@ point_t upup(buffer_t *bp, point_t off)
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}
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/* Move down one screen line */
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point_t dndn(buffer_t *bp, point_t off)
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{
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return (segnext(bp, lnstart(bp,off), off));
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}
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point_t dndn(buffer_t *bp, point_t off) { return (segnext(bp, lnstart(bp,off), off)); }
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/* Return the offset of a column on the specified line */
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point_t lncolumn(buffer_t *bp, point_t offset, int column)
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@ -373,14 +327,14 @@ point_t lncolumn(buffer_t *bp, point_t offset, int column)
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void modeline(buffer_t *bp)
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{
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int i;
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char temp[TEMPBUF];
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char mch;
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standout();
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move(bp->w_top + bp->w_rows, 0);
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mch = ((bp->b_flags & B_MODIFIED) ? '*' : '=');
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mch = bp->b_modified ? '*' : '=';
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sprintf(temp, "=%c " E_LABEL " == %s ", mch, bp->b_fname);
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addstr(temp);
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for (i = strlen(temp) + 1; i <= COLS; i++)
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addch('=');
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standend();
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@ -450,8 +404,7 @@ void display()
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}
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if (*p == '\n' || COLS <= j) {
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j -= COLS;
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if (j < 0)
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j = 0;
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if (j < 0) j = 0;
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++i;
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}
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++bp->b_epage;
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@ -509,7 +462,7 @@ void insert()
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curbp->b_point = movegap(curbp, curbp->b_point);
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*curbp->b_gap++ = *input == '\r' ? '\n' : *input;
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curbp->b_point = pos(curbp, curbp->b_egap);
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curbp->b_flags |= B_MODIFIED;
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curbp->b_modified = 1;
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}
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void backsp()
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@ -517,7 +470,7 @@ void backsp()
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curbp->b_point = movegap(curbp, curbp->b_point);
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if (curbp->b_buf < curbp->b_gap) {
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--curbp->b_gap;
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curbp->b_flags |= B_MODIFIED;
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curbp->b_modified = 1;
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}
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curbp->b_point = pos(curbp, curbp->b_egap);
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}
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@ -527,7 +480,7 @@ void delete()
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curbp->b_point = movegap(curbp, curbp->b_point);
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if (curbp->b_egap < curbp->b_ebuf) {
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curbp->b_point = pos(curbp, ++curbp->b_egap);
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curbp->b_flags |= B_MODIFIED;
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curbp->b_modified = 1;
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}
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}
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@ -564,7 +517,7 @@ void copy_cut(int cut)
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if (cut) {
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curbp->b_egap += nscrap; /* if cut expand gap down */
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curbp->b_point = pos(curbp, curbp->b_egap); /* set point to after region */
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curbp->b_flags |= B_MODIFIED;
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curbp->b_modified = 1;
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msg("%ld bytes cut.", nscrap);
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} else {
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msg("%ld bytes copied.", nscrap);
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@ -582,7 +535,7 @@ void paste()
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memcpy(curbp->b_gap, scrap, nscrap * sizeof (char_t));
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curbp->b_gap += nscrap;
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curbp->b_point = pos(curbp, curbp->b_egap);
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curbp->b_flags |= B_MODIFIED;
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curbp->b_modified = 1;
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}
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}
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@ -607,17 +560,13 @@ point_t search_forward(buffer_t *bp, point_t start_p, char *stext)
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point_t p,pp;
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char* s;
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if (0 == strlen(stext))
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return start_p;
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if (0 == strlen(stext)) return start_p;
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for (p=start_p; p < end_p; p++) {
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for (s=stext, pp=p; *s == *(ptr(bp, pp)) && *s !='\0' && pp < end_p; s++, pp++)
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;
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if (*s == '\0')
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return pp;
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if (*s == '\0') return pp;
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}
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return -1;
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}
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@ -627,7 +576,6 @@ void search()
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int c;
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point_t o_point = curbp->b_point;
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point_t found;
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searchtext[0] = '\0';
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msg("Search: %s", searchtext);
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dispmsg();
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@ -719,44 +667,36 @@ keymap_t keymap[] = {
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int main(int argc, char **argv)
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{
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if (argc != 2) fatal("usage: " E_NAME " filename\n");
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if(argc != 2)
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{
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printf("usage: %s filename\n", argv[0]);
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exit(1);
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}
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initscr();
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raw();
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noecho();
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curbp = new_buffer();
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(void)insert_file(argv[1], FALSE);
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/* Save filename irregardless of load() success. */
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strncpy(curbp->b_fname, argv[1], MAX_FNAME);
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(void)insert_file(argv[1]);
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strncpy(curbp->b_fname, argv[1], MAX_FNAME); /* save filename regardless */
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curbp->b_fname[MAX_FNAME] = '\0'; /* force truncation */
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if (!growgap(curbp, CHUNK)) fatal("Failed to allocate required memory.\n");
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key_map = keymap;
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while (!done) {
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display();
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input = get_key(key_map, &key_return);
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if (key_return != NULL) {
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(key_return->func)();
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} else {
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/* allow TAB and NEWLINE, any other control char is 'Not Bound' */
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if (*input > 31 || *input == 10 || *input == 9)
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if (*input > 31 || *input == 10 || *input == 9) /* allow TAB, NEWLINE and other control char is Not Bound */
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insert();
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else {
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fflush(stdin);
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else
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msg("Not bound");
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}
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}
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}
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if (scrap != NULL) free(scrap);
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if (curbp != NULL) free(curbp);
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move(MSGLINE, 0);
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refresh();
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noraw();
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endwin();
|
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return 0;
|
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|
|
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