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cmdedit: small optimizations
This commit is contained in:
Denis Vlasenko
parent
82b39e83ab
commit
47bdb3ac48
177
shell/cmdedit.c
177
shell/cmdedit.c
@ -28,6 +28,51 @@
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- not true viewing if length prompt less terminal width
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*/
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/*
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CONFIG_FEATURE_COMMAND_EDITING=y
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# CONFIG_FEATURE_COMMAND_EDITING_VI is not set
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CONFIG_FEATURE_COMMAND_HISTORY=15
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# CONFIG_FEATURE_COMMAND_SAVEHISTORY is not set
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# CONFIG_FEATURE_COMMAND_TAB_COMPLETION is not set
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# CONFIG_FEATURE_COMMAND_USERNAME_COMPLETION is not set
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# CONFIG_FEATURE_SH_FANCY_PROMPT is not set
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Sizes with the above:
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# size cmdedit.o
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text data bss dec hex filename
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2374 4 228 2606 a2e cmdedit.o
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# nm --size-sort cmdedit.o
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00000004 b cmdedit_prmt_len
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00000004 b cmdedit_prompt
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00000004 d cmdedit_termw
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00000004 b cmdedit_x
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00000004 b cmdedit_y
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00000004 b command_ps
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00000004 b cur_history
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00000004 b cursor
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00000004 b handlers_sets
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00000004 b len
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00000004 b n_history
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00000004 b previous_SIGWINCH_handler
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00000009 t beep
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00000017 t goto_new_line
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0000001a t input_end
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0000001b t input_backspace
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0000001e t input_forward
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00000027 t get_next_history
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00000036 t put_prompt
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00000039 t redraw
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0000003c b initial_settings
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0000003c b new_settings
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00000040 b history
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00000047 t input_delete
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0000004d t get_previous_history
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00000059 t cmdedit_reset_term
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0000006c t cmdedit_set_out_char
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00000087 t input_backward
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000000a1 t win_changed
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0000053c T cmdedit_read_input
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*/
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#include <sys/ioctl.h>
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#include "busybox.h"
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#include "cmdedit.h"
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@ -86,7 +131,7 @@ enum {
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static int cmdedit_x; /* real x terminal position */
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static int cmdedit_y; /* pseudoreal y terminal position */
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static int cmdedit_prmt_len; /* length of prompt without colores string */
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static int cmdedit_prmt_len; /* length of prompt (without colors etc) */
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static int cursor;
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static int len;
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@ -179,40 +224,34 @@ static void beep(void)
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}
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/* Move back one character */
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/* special for slow terminal */
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static void input_backward(int num)
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/* (optimized for slow terminals) */
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static void input_backward(unsigned num)
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{
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int count_y;
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if (num > cursor)
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num = cursor;
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cursor -= num; /* new cursor (in command, not terminal) */
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if (!num)
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return;
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cursor -= num;
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if (cmdedit_x >= num) {
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cmdedit_x -= num;
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if (num <= 4)
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while (num > 0) {
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putchar('\b');
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num--;
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}
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else
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printf("\033[%dD", num);
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} else {
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/* Need to go one or more lines up */
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int count_y;
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//if (cmdedit_x) {
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// /* back to first column */
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// putchar('\r');
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// num -= cmdedit_x;
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//}
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num -= cmdedit_x;//
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count_y = 1 + num / cmdedit_termw;
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//printf("\033[%dA", count_y);
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cmdedit_y -= count_y;
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cmdedit_x = cmdedit_termw * count_y - num;
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//printf("\033[%dC", cmdedit_x);
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/* go to 1st col; go up; go to correct column */
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printf("\r" "\033[%dA" "\033[%dC", count_y, cmdedit_x);//
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if (num <= 4) {
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do putchar('\b'); while (--num);
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return;
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}
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printf("\033[%uD", num);
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return;
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}
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/* Need to go one or more lines up */
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num -= cmdedit_x;
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count_y = 1 + (num / cmdedit_termw);
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cmdedit_y -= count_y;
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cmdedit_x = cmdedit_termw * count_y - num;
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/* go to 1st col; go up; go to correct column */
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printf("\r" "\033[%dA" "\033[%dC", count_y, cmdedit_x);
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}
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static void put_prompt(void)
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@ -220,6 +259,7 @@ static void put_prompt(void)
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out1str(cmdedit_prompt);
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cmdedit_x = cmdedit_prmt_len; /* count real x terminal position */
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cursor = 0;
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// Huh? what if cmdedit_prmt_len >= width?
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cmdedit_y = 0; /* new quasireal y */
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}
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@ -1105,23 +1145,15 @@ static void cmdedit_reset_term(void)
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fflush(stdout);
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}
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static void cmdedit_setwidth(int w, int redraw_flg)
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static void cmdedit_setwidth(unsigned w, int redraw_flg)
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{
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cmdedit_termw = cmdedit_prmt_len + 2;
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if (w <= cmdedit_termw) {
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cmdedit_termw = cmdedit_termw % w;
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}
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if (w > cmdedit_termw) {
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cmdedit_termw = w;
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if (redraw_flg) {
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/* new y for current cursor */
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int new_y = (cursor + cmdedit_prmt_len) / w;
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/* redraw */
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redraw((new_y >= cmdedit_y ? new_y : cmdedit_y), len - cursor);
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fflush(stdout);
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}
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cmdedit_termw = w;
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if (redraw_flg) {
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/* new y for current cursor */
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int new_y = (cursor + cmdedit_prmt_len) / w;
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/* redraw */
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redraw((new_y >= cmdedit_y ? new_y : cmdedit_y), len - cursor);
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fflush(stdout);
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}
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}
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@ -1310,7 +1342,7 @@ static void parse_prompt(const char *prmt_ptr)
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/* leave out the "vi-mode"-only case labels if vi editing isn't
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* configured. */
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#define vi_case(caselabel) USE_FEATURE_COMMAND_EDITING(caselabel)
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#define vi_case(caselabel) USE_FEATURE_COMMAND_EDITING(case caselabel)
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/* convert uppercase ascii to equivalent control char, for readability */
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#undef CTRL
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@ -1328,9 +1360,10 @@ int cmdedit_read_input(char *prompt, char command[BUFSIZ])
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smalluint prevc;
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#endif
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/* prepare before init handlers */
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cmdedit_y = 0; /* quasireal y, not true work if line > xt*yt */
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cmdedit_y = 0; /* quasireal y, not true if line > xt*yt */
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len = 0;
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command_ps = command;
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command[0] = '\0';
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getTermSettings(0, (void *) &initial_settings);
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memcpy(&new_settings, &initial_settings, sizeof(struct termios));
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@ -1341,12 +1374,10 @@ int cmdedit_read_input(char *prompt, char command[BUFSIZ])
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new_settings.c_cc[VMIN] = 1;
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new_settings.c_cc[VTIME] = 0;
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/* Turn off CTRL-C, so we can trap it */
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# ifndef _POSIX_VDISABLE
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# define _POSIX_VDISABLE '\0'
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# endif
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#ifndef _POSIX_VDISABLE
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#define _POSIX_VDISABLE '\0'
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#endif
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new_settings.c_cc[VINTR] = _POSIX_VDISABLE;
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command[0] = 0;
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setTermSettings(0, (void *) &new_settings);
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handlers_sets |= SET_RESET_TERM;
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@ -1372,30 +1403,30 @@ int cmdedit_read_input(char *prompt, char command[BUFSIZ])
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switch (ic) {
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case '\n':
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case '\r':
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vi_case( case '\n'|vbit: )
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vi_case( case '\r'|vbit: )
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vi_case('\n'|vbit:)
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vi_case('\r'|vbit:)
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/* Enter */
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goto_new_line();
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break_out = 1;
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break;
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case CTRL('A'):
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vi_case( case '0'|vbit: )
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vi_case('0'|vbit:)
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/* Control-a -- Beginning of line */
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input_backward(cursor);
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break;
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case CTRL('B'):
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vi_case( case 'h'|vbit: )
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vi_case( case '\b'|vbit: )
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vi_case( case '\x7f'|vbit: ) /* DEL */
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vi_case('h'|vbit:)
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vi_case('\b'|vbit:)
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vi_case('\x7f'|vbit:) /* DEL */
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/* Control-b -- Move back one character */
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input_backward(1);
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break;
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case CTRL('C'):
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vi_case( case CTRL('C')|vbit: )
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vi_case(CTRL('C')|vbit:)
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/* Control-c -- stop gathering input */
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goto_new_line();
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#if !ENABLE_ASH
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command[0] = 0;
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command[0] = '\0';
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len = 0;
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lastWasTab = FALSE;
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put_prompt();
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@ -1427,13 +1458,13 @@ int cmdedit_read_input(char *prompt, char command[BUFSIZ])
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}
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break;
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case CTRL('E'):
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vi_case( case '$'|vbit: )
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vi_case('$'|vbit:)
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/* Control-e -- End of line */
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input_end();
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break;
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case CTRL('F'):
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vi_case( case 'l'|vbit: )
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vi_case( case ' '|vbit: )
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vi_case('l'|vbit:)
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vi_case(' '|vbit:)
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/* Control-f -- Move forward one character */
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input_forward();
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break;
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@ -1454,22 +1485,22 @@ int cmdedit_read_input(char *prompt, char command[BUFSIZ])
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printf("\033[J");
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break;
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case CTRL('L'):
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vi_case( case CTRL('L')|vbit: )
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vi_case(CTRL('L')|vbit:)
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/* Control-l -- clear screen */
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printf("\033[H");
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redraw(0, len - cursor);
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break;
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#if MAX_HISTORY > 0
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case CTRL('N'):
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vi_case( case CTRL('N')|vbit: )
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vi_case( case 'j'|vbit: )
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vi_case(CTRL('N')|vbit:)
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vi_case('j'|vbit:)
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/* Control-n -- Get next command in history */
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if (get_next_history())
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goto rewrite_line;
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break;
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case CTRL('P'):
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vi_case( case CTRL('P')|vbit: )
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vi_case( case 'k'|vbit: )
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vi_case(CTRL('P')|vbit:)
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vi_case('k'|vbit:)
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/* Control-p -- Get previous command from history */
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if (cur_history > 0) {
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get_previous_history();
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@ -1480,7 +1511,7 @@ int cmdedit_read_input(char *prompt, char command[BUFSIZ])
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break;
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#endif
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case CTRL('U'):
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vi_case( case CTRL('U')|vbit: )
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vi_case(CTRL('U')|vbit:)
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/* Control-U -- Clear line before cursor */
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if (cursor) {
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strcpy(command, command + cursor);
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@ -1488,7 +1519,7 @@ int cmdedit_read_input(char *prompt, char command[BUFSIZ])
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}
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break;
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case CTRL('W'):
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vi_case( case CTRL('W')|vbit: )
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vi_case(CTRL('W')|vbit:)
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/* Control-W -- Remove the last word */
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while (cursor > 0 && isspace(command[cursor-1]))
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input_backspace();
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@ -1639,8 +1670,8 @@ int cmdedit_read_input(char *prompt, char command[BUFSIZ])
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goto prepare_to_die;
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/* different vt100 emulations */
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if (c == '[' || c == 'O') {
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vi_case( case '['|vbit: )
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vi_case( case 'O'|vbit: )
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vi_case('['|vbit:)
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vi_case('O'|vbit:)
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if (safe_read(0, &c, 1) < 1)
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goto prepare_to_die;
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}
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@ -1650,7 +1681,7 @@ int cmdedit_read_input(char *prompt, char command[BUFSIZ])
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if (safe_read(0, &dummy, 1) < 1)
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goto prepare_to_die;
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if (dummy != '~')
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c = 0;
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c = '\0';
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}
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switch (c) {
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#if ENABLE_FEATURE_COMMAND_TAB_COMPLETION
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@ -1671,8 +1702,8 @@ int cmdedit_read_input(char *prompt, char command[BUFSIZ])
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/* Down Arrow -- Get next command in history */
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if (!get_next_history())
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break;
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/* Rewrite the line with the selected history item */
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rewrite_line:
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/* Rewrite the line with the selected history item */
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/* change command */
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len = strlen(strcpy(command, history[cur_history]));
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/* redraw and go to eol (bol, in vi */
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