contrib/less/line.c

13  * Routines to manipulate the "line buffer".
15  * in preparation for output to the screen.
22 static char *attr = NULL;	/* Extension of linebuf to hold attributes */
98 	/* Just realloc to expand the buffer, if we can. */
182 		 *    of plinenum to re-seek if necessary. }}
226 	 * Append enough spaces to bring us to the lmargin.
247 	int to;
259 	to = from = lmargin;
262 	 * to get all combining chars.
270 			linebuf[to] = c;
271 			attr[to++] = attr[from++];
274 				linebuf[to] = linebuf[from];
275 				attr[to++] = attr[from];
309 			attr[to] = attr[from];
315 			prev_ch = linebuf[to++] = ' ';
322 		prev_attr = (to > 0) ? attr[to-1] : AT_NORMAL;
347 		linebuf[to] = linebuf[from];
348 		attr[to++] = attr[from++];
350 	curr = to;
414  * if the character were added to the current position in the line buffer.
416  * attribute sequence to be inserted, so this must be taken into account.
439 			 * so we don't even try to guess; say it doesn't move.
451 			 * Some terminals, upon failure to compose a
479  * Delete to the previous base character in the line buffer.
557  * Append a character and attribute to the line buffer.
645 		 * Try to expand it.
662  * Append a tab to the line buffer.
663  * Store spaces to represent the tab.
707 	 * Convert to printable representation.
739  * Append a character to the line buffer.
828 	 * If we need to shift the line, do it.
829 	 * But wait until we get to at least the middle of the screen,
899 			 * Use the previous overstrike to resolve it.
1013 	 * Make sure we've shifted the line, if we need to.
1020 		/* Switch to normal attribute at end of line. */
1031 	 * and append a '\0' to the end of the line.
1036 	 * (In the last case we don't want to output a newline if the terminal
1038 	 * But we do want to output a newline if the terminal ignores it in case
1052 		 * to, i.e. when the character *after* the last one to fit on a
1053 		 * line is output. But they are too hard to deal with when they
1061 		 * char on the next line.  We don't need to do this "nudge"
1109 		/* Make sure we're back to AT_NORMAL before the '\n'.  */
1129  * Analogous to forw_line(), but deals with "raw lines":
1131  * {{ This is supposed to be more efficient than forw_line(). }}
1179  * Analogous to back_line(), but deals with "raw lines".
1180  * {{ This is supposed to be more efficient than back_line(). }}
1224 			char *to;
1235 			 * Shift the data to the end of the new linebuf.
1238 			      to = linebuf + size_linebuf - 1;
1239 			     fm >= linebuf;  fm--, to--)
1240 				*to = *fm;