Function terminal_alloc

extern/editline/src/terminal.c:327–387

terminal_alloc(): * Maintain a string pool for termcap strings */

 *	Maintain a string pool for termcap strings
 */
private void
terminal_alloc(EditLine *el, const struct termcapstr *t, const char *cap)
{
	char termbuf[TC_BUFSIZE];
	size_t tlen, clen;
	char **tlist = el->el_terminal.t_str;
	char **tmp, **str = &tlist[t - tstr];

	(void) memset(termbuf, 0, sizeof(termbuf));
	if (cap == NULL || *cap == '\0') {
		*str = NULL;
		return;
	} else
		clen = strlen(cap);

	tlen = *str == NULL ? 0 : strlen(*str);

	/*
         * New string is shorter; no need to allocate space
         */
	if (clen <= tlen) {
		if (*str)
			(void) strcpy(*str, cap);	/* XXX strcpy is safe */
		return;
	}
	/*
         * New string is longer; see if we have enough space to append
         */
	if (el->el_terminal.t_loc + 3 < TC_BUFSIZE) {
						/* XXX strcpy is safe */
		(void) strcpy(*str = &el->el_terminal.t_buf[
		    el->el_terminal.t_loc], cap);
		el->el_terminal.t_loc += clen + 1;	/* one for \0 */
		return;
	}
	/*
         * Compact our buffer; no need to check compaction, cause we know it
         * fits...
         */
	tlen = 0;
	for (tmp = tlist; tmp < &tlist[T_str]; tmp++)
		if (*tmp != NULL && *tmp != '\0' && *tmp != *str) {
			char *ptr;

			for (ptr = *tmp; *ptr != '\0'; termbuf[tlen++] = *ptr++)
				continue;
			termbuf[tlen++] = '\0';
		}
	memcpy(el->el_terminal.t_buf, termbuf, TC_BUFSIZE);
	el->el_terminal.t_loc = tlen;
	if (el->el_terminal.t_loc + 3 >= TC_BUFSIZE) {
		(void) fprintf(el->el_errfile,
		    "Out of termcap string space.\n");
		return;
	}
					/* XXX strcpy is safe */
	(void) strcpy(*str = &el->el_terminal.t_buf[el->el_terminal.t_loc],
	    cap);