diff options
| -rw-r--r-- | miscutils/less.c | 974 |
1 files changed, 464 insertions, 510 deletions
diff --git a/miscutils/less.c b/miscutils/less.c index 43bc673..99149a5 100644 --- a/miscutils/less.c +++ b/miscutils/less.c @@ -23,7 +23,7 @@ * This program needs a lot of development, so consider it in a beta stage * at best. * - * TODO: + * TODO: * - Add more regular expression support - search modifiers, certain matches, etc. * - Add more complex bracket searching - currently, nested brackets are * not considered. @@ -47,10 +47,15 @@ #include <string.h> #include <termios.h> #include <unistd.h> -#include <regex.h> #include <ctype.h> + #include "busybox.h" +#ifdef CONFIG_FEATURE_LESS_REGEXP +#include "xregex.h" +#endif + + /* These are the escape sequences corresponding to special keys */ #define REAL_KEY_UP 'A' #define REAL_KEY_DOWN 'B' @@ -78,63 +83,7 @@ #define MAXLINES 10000 /* Get height and width of terminal */ -#define tty_width_height() get_terminal_width_height(0, &width, &height) - -/* Function prototypes */ -static void set_tty_cooked(void); -static void set_tty_raw(void); -static void tless_exit(int code); -static int tless_getch(void); -static void move_cursor(int x, int y); -static void clear_line(void); -static void data_readlines(void); -static void free_flines(void); -#ifdef CONFIG_FEATURE_LESS_FLAGS -static int calc_percent(void); -#endif -static int reverse_percent(int percentage); -#ifdef CONFIG_FEATURE_LESS_FLAGS -static void m_status_print(void); -static void medium_status_print(void); -#endif -static void status_print(void); -static void buffer_print(void); -static void buffer_init(void); -static void buffer_down(int nlines); -static void buffer_up(int nlines); -static void buffer_line(int linenum); -static void keypress_process(int keypress); -static void colon_process(void); -static void number_process(int first_digit); -#ifdef CONFIG_FEATURE_LESS_FLAGCS -static void flag_change(void); -static void show_flag_status(void); -#endif -static void examine_file(void); -static void next_file(void); -static void previous_file(void); -static void first_file(void); -static void remove_current_file(void); -static void full_repaint(void); -static void add_linenumbers(void); -static void save_input_to_file(void); -#ifdef CONFIG_FEATURE_LESS_MARKS -static void add_mark(void); -static void goto_mark(void); -#endif -#ifdef CONFIG_FEATURE_LESS_REGEXP -static void regex_process(void); -char *process_regex_on_line(char *line, regex_t *pattern); -char *insert_highlights(char *line, int start, int end); -static void goto_match (int match); -static void search_backwards(void); -#endif -#ifdef CONFIG_FEATURE_LESS_BRACKETS -static char opp_bracket (char bracket); -static void match_right_bracket (char bracket); -static void match_left_bracket (char bracket); -#endif -int less_main(int argc, char *argv[]); +#define tty_width_height() get_terminal_width_height(0, &width, &height) static int height; static int width; @@ -143,38 +92,38 @@ static char filename[256]; static char buffer[100][256]; static char *flines[MAXLINES]; static int current_file = 1; -static int line_pos = 0; +static int line_pos; static int num_flines; static int num_files = 1; -static int past_eof = 0; +static int past_eof; /* Command line options */ -static int E_FLAG = 0; -static int M_FLAG = 0; -static int N_FLAG = 0; -static int m_FLAG = 0; -static int TILDE_FLAG = 0; +static int E_FLAG; +static int M_FLAG; +static int N_FLAG; +static int m_FLAG; +static int TILDE_FLAG; /* This is needed so that program behaviour changes when input comes from stdin */ -static int inp_stdin = 0; +static int inp_stdin; /* This is required so that when a file is requested to be examined after - input has come from stdin (e.g. dmesg | less), the input stream from + input has come from stdin (e.g. dmesg | less), the input stream from the keyboard still stays the same. If it switched back to stdin, keyboard input wouldn't work. */ -static int ea_inp_stdin = 0; +static int ea_inp_stdin; #ifdef CONFIG_FEATURE_LESS_MARKS static int mark_lines[15][2]; -static int num_marks = 0; +static int num_marks; #endif #ifdef CONFIG_FEATURE_LESS_REGEXP -static int match_found = 0; +static int match_found; static int match_lines[100]; -static int match_pos = 0; -static int num_matches = 0; -static int match_backwards = 0; +static int match_pos; +static int num_matches; +static int match_backwards; static int num_back_match = 1; #endif @@ -185,47 +134,47 @@ static struct termios term_orig, term_vi; static FILE *inp; /* Reset terminal input to normal */ -static void set_tty_cooked() { - fflush(stdout); - tcsetattr(0, TCSANOW, &term_orig); +static void set_tty_cooked(void) { + fflush(stdout); + tcsetattr(0, TCSANOW, &term_orig); } /* Set terminal input to raw mode */ -static void set_tty_raw() { +static void set_tty_raw(void) { tcgetattr(0, &term_orig); - term_vi = term_orig; - term_vi.c_lflag &= (~ICANON & ~ECHO); - term_vi.c_iflag &= (~IXON & ~ICRNL); - term_vi.c_oflag &= (~ONLCR); - term_vi.c_cc[VMIN] = 1; - term_vi.c_cc[VTIME] = 0; - tcsetattr(0, TCSANOW, &term_vi); + term_vi = term_orig; + term_vi.c_lflag &= (~ICANON & ~ECHO); + term_vi.c_iflag &= (~IXON & ~ICRNL); + term_vi.c_oflag &= (~ONLCR); + term_vi.c_cc[VMIN] = 1; + term_vi.c_cc[VTIME] = 0; + tcsetattr(0, TCSANOW, &term_vi); } /* Exit the program gracefully */ static void tless_exit(int code) { - + /* TODO: We really should save the terminal state when we start, - and restore it when we exit. Less does this with the + and restore it when we exit. Less does this with the "ti" and "te" termcap commands; can this be done with only termios.h? */ - + putchar('\n'); exit(code); } /* Grab a character from input without requiring the return key. If the character is ASCII \033, get more characters and assign certain sequences - special return codes. Note that this function works best with raw input. */ -int tless_getch() { - + special return codes. Note that this function works best with raw input. */ +static int tless_getch(void) { + set_tty_raw(); char input_key[3]; - + input_key[0] = getc(inp); /* Detect escape sequences (i.e. arrow keys) and handle them accordingly */ - + if (input_key[0] == '\033') { input_key[1] = getc(inp); input_key[2] = getc(inp); @@ -253,25 +202,38 @@ int tless_getch() { return 0; } -/* Move the cursor to a position (x,y), where (0,0) is the +/* Move the cursor to a position (x,y), where (0,0) is the top-left corner of the console */ static void move_cursor(int x, int y) { printf("\033[%i;%iH", x, y); } -static void clear_line() { +static void clear_line(void) { move_cursor(height, 0); printf("\033[K"); } -static void data_readlines() { - +/* This adds line numbers to every line, as the -N flag necessitates */ +static void add_linenumbers(void) { + + char current_line[256]; + int i; + + for (i = 0; i <= num_flines; i++) { + safe_strncpy(current_line, flines[i], 256); + flines[i] = xrealloc(flines[i], strlen(current_line) + 7 ); + sprintf(flines[i],"%5d %s", i+1, current_line); + } +} + +static void data_readlines(void) { + int i; char current_line[256]; FILE *fp; - + fp = (inp_stdin) ? stdin : bb_xfopen(filename, "rt"); - + for (i = 0; (!feof(fp)) && (i <= MAXLINES); i++) { strcpy(current_line, ""); fgets(current_line, 256, fp); @@ -281,10 +243,10 @@ static void data_readlines() { num_flines = i - 2; /* Reset variables for a new file */ - + line_pos = 0; past_eof = 0; - + fclose(fp); if (inp_stdin) @@ -296,29 +258,29 @@ static void data_readlines() { fclose(inp); inp = fopen(CURRENT_TTY, "r"); } - + if (N_FLAG) add_linenumbers(); } /* Free the file data */ -static void free_flines() { - +static void free_flines(void) { + int i; - + for (i = 0; i <= num_flines; i++) free(flines[i]); } #ifdef CONFIG_FEATURE_LESS_FLAGS /* Calculate the percentage the current line position is through the file */ -int calc_percent() { +static int calc_percent(void) { return ((100 * (line_pos + height - 2) / num_flines) + 1); } #endif /* Turn a percentage into a line number */ -int reverse_percent(int percentage) { +static int reverse_percent(int percentage) { double linenum = percentage; linenum = ((linenum / 100) * num_flines) - 1; return(linenum); @@ -326,10 +288,10 @@ int reverse_percent(int percentage) { #ifdef CONFIG_FEATURE_LESS_FLAGS /* Print a status line if -M was specified */ -static void m_status_print() { +static void m_status_print(void) { int percentage; - + if (!past_eof) { if (!line_pos) { if (num_files > 1) @@ -341,7 +303,7 @@ static void m_status_print() { else { printf("%s %s lines %i-%i/%i ", HIGHLIGHT, filename, line_pos + 1, line_pos + height - 1, num_flines + 1); } - + if (line_pos == num_flines - height + 2) { printf("(END) %s", NORMAL); if ((num_files > 1) && (current_file != num_files)) @@ -361,11 +323,11 @@ static void m_status_print() { } /* Print a status line if -m was specified */ -static void medium_status_print() { +static void medium_status_print(void) { int percentage; percentage = calc_percent(); - + if (!line_pos) printf("%s%s %i%s%s", HIGHLIGHT, filename, percentage, "%", NORMAL); else if (line_pos == num_flines - height + 2) @@ -376,11 +338,11 @@ static void medium_status_print() { #endif /* Print the status line */ -static void status_print() { - +static void status_print(void) { + /* Change the status if flags have been set */ -#ifdef CONFIG_FEATURE_LESS_FLAGS - if (M_FLAG) +#ifdef CONFIG_FEATURE_LESS_FLAGS + if (M_FLAG) m_status_print(); else if (m_FLAG) medium_status_print(); @@ -406,10 +368,10 @@ static void status_print() { } /* Print the buffer */ -static void buffer_print() { - +static void buffer_print(void) { + int i; - + if (num_flines >= height - 2) { printf("%s", CLEAR); move_cursor(0,0); @@ -429,19 +391,19 @@ static void buffer_print() { } /* Initialise the buffer */ -static void buffer_init() { - +static void buffer_init(void) { + int i; - + for (i = 0; i < (height - 1); i++) memset(buffer[i], '\0', 256); - - /* Fill the buffer until the end of the file or the + + /* Fill the buffer until the end of the file or the end of the buffer is reached */ for (i = 0; (i < (height - 1)) && (i <= num_flines); i++) { strcpy(buffer[i], flines[i]); } - + /* If the buffer still isn't full, fill it with blank lines */ for (; i < (height - 1); i++) { strcpy(buffer[i], ""); @@ -450,9 +412,9 @@ static void buffer_init() { /* Move the buffer up and down in the file in order to scroll */ static void buffer_down(int nlines) { - + int i; - + if (!past_eof) { if (line_pos + (height - 3) + nlines < num_flines) { line_pos += nlines; @@ -461,8 +423,8 @@ static void buffer_down(int nlines) { } else { /* As the number of lines requested was too large, we just move - to the end of the file */ - while (line_pos + (height - 3) + 1 < num_flines) { + to the end of the file */ + while (line_pos + (height - 3) + 1 < num_flines) { line_pos += 1; for (i = 0; i < (height - 1); i++) strcpy(buffer[i], flines[line_pos + i]); @@ -476,10 +438,10 @@ static void buffer_down(int nlines) { } static void buffer_up(int nlines) { - + int i; int tilde_line; - + if (!past_eof) { if (line_pos - nlines >= 0) { line_pos -= nlines; @@ -499,7 +461,7 @@ static void buffer_up(int nlines) { else { /* Work out where the tildes start */ tilde_line = num_flines - line_pos + 3; - + line_pos -= nlines; /* Going backwards nlines lines has taken us to a point where nothing is past the EOF, so we revert to normal. */ @@ -509,7 +471,7 @@ static void buffer_up(int nlines) { } else { /* We only move part of the buffer, as the rest - is past the EOF */ + is past the EOF */ for (i = 0; i < (height - 1); i++) { if (i < tilde_line - nlines + 1) strcpy(buffer[i], flines[line_pos + i]); @@ -518,12 +480,12 @@ static void buffer_up(int nlines) { strcpy(buffer[i], "~\n"); } } - } + } } } static void buffer_line(int linenum) { - + int i; past_eof = 0; @@ -550,125 +512,103 @@ static void buffer_line(int linenum) { } } -static void keypress_process(int keypress) { - switch (keypress) { - case KEY_DOWN: case 'e': case 'j': case '\015': - buffer_down(1); - buffer_print(); - break; - case KEY_UP: case 'y': case 'k': - buffer_up(1); - buffer_print(); - break; - case PAGE_DOWN: case ' ': case 'z': - buffer_down(height - 1); - buffer_print(); - break; - case PAGE_UP: case 'w': case 'b': - buffer_up(height - 1); - buffer_print(); - break; - case 'd': - buffer_down((height - 1) / 2); - buffer_print(); - break; - case 'u': - buffer_up((height - 1) / 2); - buffer_print(); - break; - case 'g': case 'p': case '<': case '%': - buffer_up(num_flines + 1); - buffer_print(); - break; - case 'G': case '>': - buffer_down(num_flines + 1); - buffer_print(); - break; - case 'q': case 'Q': - tless_exit(0); - break; -#ifdef CONFIG_FEATURE_LESS_MARKS - case 'm': - add_mark(); - buffer_print(); - break; - case '\'': - goto_mark(); - buffer_print(); - break; -#endif - case 'r': - buffer_print(); - break; - case 'R': - full_repaint(); - break; - case 's': - if (inp_stdin) - save_input_to_file(); - break; - case 'E': - examine_file(); - break; -#ifdef CONFIG_FEATURE_LESS_FLAGS - case '=': - clear_line(); - m_status_print(); - break; -#endif -#ifdef CONFIG_FEATURE_LESS_REGEXP - case '/': - regex_process(); - buffer_print(); - break; - case 'n': - goto_match(match_pos + 1); - buffer_print(); - break; - case 'N': - goto_match(match_pos - 1); - buffer_print(); - break; - case '?': - search_backwards(); - buffer_print(); - break; -#endif -#ifdef CONFIG_FEATURE_LESS_FLAGCS - case '-': - flag_change(); - buffer_print(); - break; - case '_': - show_flag_status(); - break; -#endif -#ifdef CONFIG_FEATURE_LESS_BRACKETS - case '{': case '(': case '[': - match_right_bracket(keypress); - break; - case '}': case ')': case ']': - match_left_bracket(keypress); - break; -#endif - case ':': - colon_process(); - break; - default: - break; +static void examine_file(void) { + + int newline_offset; + + clear_line(); + printf("Examine: "); + fgets(filename, 256, inp); + + /* As fgets adds a newline to the end of an input string, we + need to remove it */ + newline_offset = strlen(filename) - 1; + filename[newline_offset] = '\0'; + + files[num_files] = bb_xstrndup(filename, (strlen(filename) + 1) * sizeof(char)); + current_file = num_files + 1; + num_files++; + + inp_stdin = 0; + ea_inp_stdin = 1; + free_flines(); + data_readlines(); + buffer_init(); + buffer_print(); +} + + +static void next_file(void) { + if (current_file != num_files) { + current_file++; + strcpy(filename, files[current_file - 1]); + free_flines(); + data_readlines(); + buffer_init(); + buffer_print(); + } + else { + clear_line(); + printf("%s%s%s", HIGHLIGHT, "No next file", NORMAL); + } +} + +static void previous_file(void) { + if (current_file != 1) { + current_file--; + strcpy(filename, files[current_file - 1]); + + free_flines(); + data_readlines(); + buffer_init(); + buffer_print(); + } + else { + clear_line(); + printf("%s%s%s", HIGHLIGHT, "No previous file", NORMAL); } - if (isdigit(keypress)) - number_process(keypress); } -static void colon_process() { - +static void first_file(void) { + if (current_file != 1) { + current_file = 1; + strcpy(filename, files[current_file - 1]); + free_flines(); + data_readlines(); + buffer_init(); + buffer_print(); + } +} + +static void remove_current_file(void) { + + int i; + + if (current_file != 1) { + previous_file(); + for (i = 3; i <= num_files; i++) + files[i - 2] = files[i - 1]; + num_files--; + buffer_print(); + } + else { + next_file(); + for (i = 2; i <= num_files; i++) + files[i - 2] = files[i - 1]; + num_files--; + current_file--; + buffer_print(); + } +} + +static void colon_process(void) { + int keypress; - + /* Clear the current line and print a prompt */ clear_line(); printf(" :"); - + keypress = tless_getch(); switch (keypress) { case 'd': @@ -700,24 +640,158 @@ static void colon_process() { } } +#ifdef CONFIG_FEATURE_LESS_REGEXP +/* The below two regular expression handler functions NEED development. */ + +/* Get a regular expression from the user, and then go through the current + file line by line, running a processing regex function on each one. */ + +static char *insert_highlights (char *line, int start, int end) { + + char *new_line = (char *) malloc((sizeof(char) * (strlen(line) + 1)) + 10); + + memset(new_line, 0, ((sizeof(char) * (strlen(line) + 1)) + 10)); + strncat(new_line, line, start); + strcat(new_line, HIGHLIGHT); + strncat(new_line, line + start, end - start); + strcat(new_line, NORMAL); + strncat(new_line, line + end, strlen(line) - end); + + return new_line; +} + +static char *process_regex_on_line(char *line, regex_t *pattern) { + /* This function takes the regex and applies it to the line. + Each part of the line that matches has the HIGHLIGHT + and NORMAL escape sequences placed around it by + insert_highlights, and then the line is returned. */ + + int match_status; + char *line2 = (char *) malloc((sizeof(char) * (strlen(line) + 1)) + 64); + char sub_line[256]; + int prev_eo = 0; + memset(sub_line, 0, 256); + strcpy(line2, line); + regmatch_t match_structs; + + match_found = 0; + match_status = regexec(pattern, line2, 1, &match_structs, 0); + + while (match_status == 0) { + + memset(sub_line, 0, 256); + + if (match_found == 0) + match_found = 1; + + line2 = insert_highlights(line2, match_structs.rm_so + prev_eo, match_structs.rm_eo + prev_eo); + if (match_structs.rm_eo + 11 + prev_eo < strlen(line2)) + strcat(sub_line, line2 + match_structs.rm_eo + 11 + prev_eo); + + prev_eo += match_structs.rm_eo + 11; + match_status = regexec(pattern, sub_line, 1, &match_structs, REG_NOTBOL); + } + + return line2; +} + +static void regex_process(void) { + + char uncomp_regex[100]; + char current_line[256]; + int i; + int j = 0; + regex_t *pattern; + + /* Reset variables */ + match_lines[0] = -1; + match_pos = 0; + num_matches = 0; + match_found = 0; + + pattern = (regex_t *) malloc(sizeof(regex_t)); + memset(pattern, 0, sizeof(regex_t)); + + /* Get the uncompiled regular expression from the user */ + clear_line(); + if (match_backwards) + printf("?"); + else + printf("/"); + scanf("%s", uncomp_regex); + + /* Compile the regex and check for errors */ + xregcomp(pattern, uncomp_regex, 0); + + /* Run the regex on each line of the current file here */ + for (i = 0; i <= num_flines; i++) { + strcpy(current_line, process_regex_on_line(flines[i], pattern)); + flines[i] = (char *) bb_xstrndup(current_line, sizeof(char) * (strlen(current_line)+1)); + + if (match_found) { + match_lines[j] = i; + j++; + } + } + + num_matches = j; + + if ((match_lines[0] != -1) && (num_flines > height - 2)) + buffer_line(match_lines[0]); + else + buffer_init(); +} + +static void goto_match(int match) { + + /* This goes to a specific match - all line positions of matches are + stored within the match_lines[] array. */ + if ((match < num_matches) && (match >= 0)) { + buffer_line(match_lines[match]); + match_pos = match; + } +} + +static void search_backwards(void) { + + int current_linepos = line_pos; + int i; + + match_backwards = 1; + regex_process(); + + for (i = 0; i < num_matches; i++) { + if (match_lines[i] > current_linepos) { + buffer_line(match_lines[i - num_back_match]); + break; + } + } + + /* Reset variables */ + match_backwards = 0; + num_back_match = 1; + +} +#endif + static void number_process(int first_digit) { - + int i = 1; int num; char num_input[80]; char keypress; num_input[0] = first_digit; - + /* Clear the current line, print a prompt, and then print the digit */ clear_line(); printf(":%c", first_digit); - + /* Receive input until a letter is given */ while((num_input[i] = tless_getch()) && isdigit(num_input[i])) { printf("%c",num_input[i]); i++; } - + /* Take the final letter out of the digits string */ keypress = num_input[i]; num_input[i] = '\0'; @@ -765,14 +839,14 @@ static void number_process(int first_digit) { } #ifdef CONFIG_FEATURE_LESS_FLAGCS -static void flag_change() { - +static void flag_change(void) { + int keypress; - + clear_line(); printf("-"); keypress = tless_getch(); - + switch (keypress) { case 'M': M_FLAG = !M_FLAG; @@ -791,11 +865,11 @@ static void flag_change() { } } -static void show_flag_status() { - +static void show_flag_status(void) { + int keypress; int flag_val; - + clear_line(); printf("_"); keypress = tless_getch(); @@ -820,101 +894,13 @@ static void show_flag_status() { flag_val = 0; break; } - - clear_line(); - printf("%s%s%i%s", HIGHLIGHT, "The status of the flag is: ", flag_val, NORMAL); -} -#endif -static void examine_file() { - - int newline_offset; - clear_line(); - printf("Examine: "); - fgets(filename, 256, inp); - - /* As fgets adds a newline to the end of an input string, we - need to remove it */ - newline_offset = strlen(filename) - 1; - filename[newline_offset] = '\0'; - - files[num_files] = bb_xstrndup(filename, (strlen(filename) + 1) * sizeof(char)); - current_file = num_files + 1; - num_files++; - - inp_stdin = 0; - ea_inp_stdin = 1; - free_flines(); - data_readlines(); - buffer_init(); - buffer_print(); -} - -static void next_file() { - if (current_file != num_files) { - current_file++; - strcpy(filename, files[current_file - 1]); - free_flines(); - data_readlines(); - buffer_init(); - buffer_print(); - } - else { - clear_line(); - printf("%s%s%s", HIGHLIGHT, "No next file", NORMAL); - } -} - -static void previous_file() { - if (current_file != 1) { - current_file--; - strcpy(filename, files[current_file - 1]); - - free_flines(); - data_readlines(); - buffer_init(); - buffer_print(); - } - else { - clear_line(); - printf("%s%s%s", HIGHLIGHT, "No previous file", NORMAL); - } -} - -static void first_file() { - if (current_file != 1) { - current_file = 1; - strcpy(filename, files[current_file - 1]); - free_flines(); - data_readlines(); - buffer_init(); - buffer_print(); - } -} - -static void remove_current_file() { - - int i; - - if (current_file != 1) { - previous_file(); - for (i = 3; i <= num_files; i++) - files[i - 2] = files[i - 1]; - num_files--; - buffer_print(); - } - else { - next_file(); - for (i = 2; i <= num_files; i++) - files[i - 2] = files[i - 1]; - num_files--; - current_file--; - buffer_print(); - } + printf("%s%s%i%s", HIGHLIGHT, "The status of the flag is: ", flag_val != 0, NORMAL); } +#endif -static void full_repaint() { +static void full_repaint(void) { int temp_line_pos = line_pos; data_readlines(); @@ -923,25 +909,13 @@ static void full_repaint() { buffer_print(); } -/* This adds line numbers to every line, as the -N flag necessitates */ -static void add_linenumbers() { - char current_line[256]; - int i; - - for (i = 0; i <= num_flines; i++) { - safe_strncpy(current_line, flines[i], 256); - flines[i] = xrealloc(flines[i], strlen(current_line) + 7 ); - sprintf(flines[i],"%5d %s", i+1, current_line); - } -} +static void save_input_to_file(void) { -static void save_input_to_file() { - char current_line[256]; int i; FILE *fp; - + clear_line(); printf("Log file: "); fgets(current_line, 256, inp); @@ -958,18 +932,18 @@ static void save_input_to_file() { } #ifdef CONFIG_FEATURE_LESS_MARKS -static void add_mark() { +static void add_mark(void) { int letter; int mark_line; - + clear_line(); printf("Mark: "); letter = tless_getch(); - + if (isalpha(letter)) { mark_line = line_pos; - + /* If we exceed 15 marks, start overwriting previous ones */ if (num_marks == 14) num_marks = 0; @@ -984,11 +958,11 @@ static void add_mark() { } } -static void goto_mark() { +static void goto_mark(void) { int letter; int i; - + clear_line(); printf("Go to mark: "); letter = tless_getch(); @@ -1001,7 +975,7 @@ static void goto_mark() { if ((num_marks == 14) && (letter != mark_lines[14][0])) { clear_line(); printf("%s%s%s", HIGHLIGHT, "Mark not set", NORMAL); - } + } } else { clear_line(); @@ -1010,137 +984,6 @@ static void goto_mark() { } #endif -#ifdef CONFIG_FEATURE_LESS_REGEXP -/* The below two regular expression handler functions NEED development. */ - -/* Get a regular expression from the user, and then go through the current - file line by line, running a processing regex function on each one. */ -static void regex_process() { - - char uncomp_regex[100]; - char current_line[256]; - int i; - int j = 0; - regex_t *pattern; - - /* Reset variables */ - match_lines[0] = -1; - match_pos = 0; - num_matches = 0; - match_found = 0; - - pattern = (regex_t *) malloc(sizeof(regex_t)); - memset(pattern, 0, sizeof(regex_t)); - - /* Get the uncompiled regular expression from the user */ - clear_line(); - if (match_backwards) - printf("?"); - else - printf("/"); - scanf("%s", uncomp_regex); - - /* Compile the regex and check for errors */ - xregcomp(pattern, uncomp_regex, 0); - - /* Run the regex on each line of the current file here */ - for (i = 0; i <= num_flines; i++) { - strcpy(current_line, process_regex_on_line(flines[i], pattern)); - flines[i] = (char *) bb_xstrndup(current_line, sizeof(char) * (strlen(current_line)+1)); - - if (match_found) { - match_lines[j] = i; - j++; - } - } - - num_matches = j; - - if ((match_lines[0] != -1) && (num_flines > height - 2)) - buffer_line(match_lines[0]); - else - buffer_init(); -} - -char *process_regex_on_line(char *line, regex_t *pattern) { - /* This function takes the regex and applies it to the line. - Each part of the line that matches has the HIGHLIGHT - and NORMAL escape sequences placed around it by - insert_highlights, and then the line is returned. */ - - int match_status; - char *line2 = (char *) malloc((sizeof(char) * (strlen(line) + 1)) + 64); - char sub_line[256]; - int prev_eo = 0; - memset(sub_line, 0, 256); - strcpy(line2, line); - regmatch_t match_structs; - - match_found = 0; - match_status = regexec(pattern, line2, 1, &match_structs, 0); - - while (match_status == 0) { - - memset(sub_line, 0, 256); - - if (match_found == 0) - match_found = 1; - - line2 = insert_highlights(line2, match_structs.rm_so + prev_eo, match_structs.rm_eo + prev_eo); - if (match_structs.rm_eo + 11 + prev_eo < strlen(line2)) - strcat(sub_line, line2 + match_structs.rm_eo + 11 + prev_eo); - - prev_eo += match_structs.rm_eo + 11; - match_status = regexec(pattern, sub_line, 1, &match_structs, REG_NOTBOL); - } - - return line2; -} - -char *insert_highlights (char *line, int start, int end) { - - char *new_line = (char *) malloc((sizeof(char) * (strlen(line) + 1)) + 10); - memset(new_line, 0, ((sizeof(char) * (strlen(line) + 1)) + 10)); - strncat(new_line, line, start); - strcat(new_line, HIGHLIGHT); - strncat(new_line, line + start, end - start); - strcat(new_line, NORMAL); - strncat(new_line, line + end, strlen(line) - end); - - return new_line; -} - -static void goto_match(int match) { - - /* This goes to a specific match - all line positions of matches are - stored within the match_lines[] array. */ - if ((match < num_matches) && (match >= 0)) { - buffer_line(match_lines[match]); - match_pos = match; - } -} - -static void search_backwards() { - - int current_linepos = line_pos; - int i; - - match_backwards = 1; - regex_process(); - - for (i = 0; i < num_matches; i++) { - if (match_lines[i] > current_linepos) { - buffer_line(match_lines[i - num_back_match]); - break; - } - } - - /* Reset variables */ - match_backwards = 0; - num_back_match = 1; - -} -#endif #ifdef CONFIG_FEATURE_LESS_BRACKETS @@ -1166,10 +1009,10 @@ static char opp_bracket (char bracket) { } static void match_right_bracket(char bracket) { - + int bracket_line = -1; int i; - + if (strchr(flines[line_pos], bracket) == NULL) { clear_line(); printf("%s%s%s", HIGHLIGHT, "No bracket in top line", NORMAL); @@ -1193,7 +1036,7 @@ static void match_right_bracket(char bracket) { } static void match_left_bracket (char bracket) { - + int bracket_line = -1; int i; @@ -1215,19 +1058,130 @@ static void match_left_bracket (char bracket) { clear_line(); printf("%s%s%s", HIGHLIGHT, "No matching bracket found", NORMAL); } - + buffer_line(bracket_line); buffer_print(); } } +#endif /* CONFIG_FEATURE_LESS_BRACKETS */ + +static void keypress_process(int keypress) { + switch (keypress) { + case KEY_DOWN: case 'e': case 'j': case '\015': + buffer_down(1); + buffer_print(); + break; + case KEY_UP: case 'y': case 'k': + buffer_up(1); + buffer_print(); + break; + case PAGE_DOWN: case ' ': case 'z': + buffer_down(height - 1); + buffer_print(); + break; + case PAGE_UP: case 'w': case 'b': + buffer_up(height - 1); + buffer_print(); + break; + case 'd': + buffer_down((height - 1) / 2); + buffer_print(); + break; + case 'u': + buffer_up((height - 1) / 2); + buffer_print(); + break; + case 'g': case 'p': case '<': case '%': + buffer_up(num_flines + 1); + buffer_print(); + break; + case 'G': case '>': + buffer_down(num_flines + 1); + buffer_print(); + break; + case 'q': case 'Q': + tless_exit(0); + break; +#ifdef CONFIG_FEATURE_LESS_MARKS + case 'm': + add_mark(); + buffer_print(); + break; + case '\'': + goto_mark(); + buffer_print(); + break; +#endif + case 'r': + buffer_print(); + break; + case 'R': + full_repaint(); + break; + case 's': + if (inp_stdin) + save_input_to_file(); + break; + case 'E': + examine_file(); + break; +#ifdef CONFIG_FEATURE_LESS_FLAGS + case '=': + clear_line(); + m_status_print(); + break; #endif +#ifdef CONFIG_FEATURE_LESS_REGEXP + case '/': + regex_process(); + buffer_print(); + break; + case 'n': + goto_match(match_pos + 1); + buffer_print(); + break; + case 'N': + goto_match(match_pos - 1); + buffer_print(); + break; + case '?': + search_backwards(); + buffer_print(); + break; +#endif +#ifdef CONFIG_FEATURE_LESS_FLAGCS + case '-': + flag_change(); + buffer_print(); + break; + case '_': + show_flag_status(); + break; +#endif +#ifdef CONFIG_FEATURE_LESS_BRACKETS + case '{': case '(': case '[': + match_right_bracket(keypress); + break; + case '}': case ')': case ']': + match_left_bracket(keypress); + break; +#endif + case ':': + colon_process(); + break; + default: + break; + } + if (isdigit(keypress)) + number_process(keypress); +} int less_main(int argc, char **argv) { - + unsigned long flags; int keypress; - + flags = bb_getopt_ulflags(argc, argv, "EMNm~"); E_FLAG = (flags & 1); M_FLAG = (flags & 2); @@ -1239,7 +1193,7 @@ int less_main(int argc, char **argv) { argv += optind; files = argv; num_files = argc; - + if (!num_files) { if (ttyname(STDIN_FILENO) == NULL) inp_stdin = 1; @@ -1248,13 +1202,13 @@ int less_main(int argc, char **argv) { bb_show_usage(); } } - + strcpy(filename, (inp_stdin) ? "stdin" : files[0]); tty_width_height(); data_readlines(); buffer_init(); buffer_print(); - + while (1) { keypress = tless_getch(); keypress_process(keypress); |