From e865e81d34efb96417c549e9c326fb1c46dafbc7 Mon Sep 17 00:00:00 2001 From: Denis Vlasenko Date: Thu, 21 Dec 2006 13:24:58 +0000 Subject: less: stop dying on bad regexps, quietly pipe data w/o user interaction if stdout is not a tty. size optimizations --- miscutils/less.c | 256 +++++++++++++++++++++++++++++++------------------------ 1 file changed, 146 insertions(+), 110 deletions(-) (limited to 'miscutils/less.c') diff --git a/miscutils/less.c b/miscutils/less.c index 6843dddcb..068c3f393 100644 --- a/miscutils/less.c +++ b/miscutils/less.c @@ -50,9 +50,10 @@ /* The escape codes for highlighted and normal text */ #define HIGHLIGHT "\033[7m" #define NORMAL "\033[0m" - /* The escape code to clear the screen */ #define CLEAR "\033[H\033[J" +/* The escape code to clear to end of line */ +#define CLEAR_2_EOL "\033[K" #define MAXLINES CONFIG_FEATURE_LESS_MAXLINES @@ -121,9 +122,9 @@ static void tless_exit(int code) static int tless_getch(void) { int input; - /* Set terminal input to raw mode (taken from vi.c) */ + /* Set terminal input to raw mode (taken from vi.c) */ tcsetattr(fileno(inp), TCSANOW, &term_vi); - + again: input = getc(inp); /* Detect escape sequences (i.e. arrow keys) and handle them accordingly */ @@ -136,27 +137,56 @@ static int tless_getch(void) i = input - REAL_KEY_UP; if (i < 4) return 20 + i; - else if ((i = input - REAL_PAGE_UP) < 4) + i = input - REAL_PAGE_UP; + if (i < 4) return 24 + i; - else - return 0; /* ?? */ + return 0; /* ?? */ } - /* The input is a normal ASCII value */ + /* Reject almost all control chars */ + if (input < ' ' && input != 0x0d && input != 8) goto again; set_tty_cooked(); return input; } +static char* tless_gets(void) +{ + int c; + int i = 0; + char *result = xzalloc(1); + while (1) { + c = tless_getch(); + if (c == 0x0d) + return result; + if (c == 0x7f) c = 8; + if (c == 8 && i) { + printf("\x8 \x8"); + i--; + } + if (c < ' ') + continue; + putchar(c); + result[i++] = c; + result = xrealloc(result, i+1); + result[i] = '\0'; + if (i >= width-1) return result; + } +} + /* 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) +static void move_cursor(int line, int row) { - printf("\033[%i;%iH", x, y); + printf("\033[%u;%uH", line, row); } static void clear_line(void) { - move_cursor(height, 0); - printf("\033[K"); + printf("\033[%u;0H" CLEAR_2_EOL, height); +} + +static void print_hilite(const char *str) +{ + printf(HIGHLIGHT"%s"NORMAL, str); } static void data_readlines(void) @@ -235,26 +265,26 @@ static void m_status_print(void) if (!line_pos) { if (num_files > 1) { - printf("%s%s %s%i%s%i%s%i-%i/%i ", HIGHLIGHT, - filename, "(file ", current_file, " of ", num_files, ") lines ", + printf(HIGHLIGHT"%s (file %i of %i) lines %i-%i/%i ", + filename, current_file, num_files, line_pos + 1, line_pos + height - 1, num_flines + 1); } else { - printf("%s%s lines %i-%i/%i ", HIGHLIGHT, + printf(HIGHLIGHT"%s lines %i-%i/%i ", filename, line_pos + 1, line_pos + height - 1, num_flines + 1); } } else { - printf("%s %s lines %i-%i/%i ", HIGHLIGHT, filename, + printf(HIGHLIGHT" %s lines %i-%i/%i ", 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)) - printf("%s- Next: %s%s", HIGHLIGHT, files[current_file], NORMAL); + printf("(END) "NORMAL); + if (num_files > 1 && current_file != num_files) + printf(HIGHLIGHT"- Next: %s"NORMAL, files[current_file]); } else { percentage = calc_percent(); - printf("%i%% %s", percentage, NORMAL); + printf("%i%% "NORMAL, percentage); } } @@ -265,11 +295,11 @@ static void medium_status_print(void) percentage = calc_percent(); if (!line_pos) - printf("%s%s %i%%%s", HIGHLIGHT, filename, percentage, NORMAL); + printf(HIGHLIGHT"%s %i%%"NORMAL, filename, percentage); else if (line_pos == num_flines - height + 2) - printf("%s(END)%s", HIGHLIGHT, NORMAL); + print_hilite("(END)"); else - printf("%s%i%%%s", HIGHLIGHT, percentage, NORMAL); + printf(HIGHLIGHT"%i%%"NORMAL, percentage); } #endif @@ -286,14 +316,14 @@ static void status_print(void) else { #endif if (!line_pos) { - printf("%s%s %s", HIGHLIGHT, filename, NORMAL); + print_hilite(filename); if (num_files > 1) - printf("%s%s%i%s%i%s%s", HIGHLIGHT, "(file ", - current_file, " of ", num_files, ")", NORMAL); + printf(HIGHLIGHT"(file %i of %i)"NORMAL, + current_file, num_files); } else if (line_pos == num_flines - height + 2) { - printf("%s%s %s", HIGHLIGHT, "(END)", NORMAL); - if ((num_files > 1) && (current_file != num_files)) - printf("%s%s%s%s", HIGHLIGHT, "- Next: ", files[current_file], NORMAL); + print_hilite("(END) "); + if (num_files > 1 && current_file != num_files) + printf(HIGHLIGHT"- Next: %s"NORMAL, files[current_file]); } else { putchar(':'); } @@ -336,13 +366,6 @@ static void print_found(const char *line) memset(p, '.', n); p += n; str += n; - /* - do { - if (*str == '\x7f') { *p++ = '?'; str++; } - else if (*str == '\x9b') { *p++ = '{'; str++; } - else *p++ = ctrlconv[(unsigned char)*str++]; - } while (--n); - */ } strcpy(p, str); @@ -358,13 +381,11 @@ static void print_found(const char *line) goto start; while (match_status == 0) { - char *new = xasprintf("%s" "%.*s" "%s" "%.*s" "%s", + char *new = xasprintf("%s%.*s"HIGHLIGHT"%.*s"NORMAL, growline ? : "", match_structs.rm_so, str, - HIGHLIGHT, match_structs.rm_eo - match_structs.rm_so, - str + match_structs.rm_so, - NORMAL); + str + match_structs.rm_so); free(growline); growline = new; str += match_structs.rm_eo; line += match_structs.rm_eo; @@ -375,10 +396,10 @@ static void print_found(const char *line) } if (!growline) { - puts(str); + printf("%s"CLEAR_2_EOL"\n", str); return; } - printf("%s%s\n", growline, str); + printf("%s%s"CLEAR_2_EOL"\n", growline, str); free(growline); } @@ -398,14 +419,20 @@ static void print_ascii(const char *str) n = strspn(str, controls); p = buf; do { - if (*str == '\x7f') { *p++ = '?'; str++; } - else if (*str == '\x9b') { *p++ = '{'; str++; } - else *p++ = ctrlconv[(unsigned char)*str++]; + if (*str == 0x7f) + *p++ = '?'; + else if (*str == 0x9b) + /* VT100's CSI, aka Meta-ESC. Who's inventor? */ + /* I want to know who committed this sin */ + *p++ = '{'; + else + *p++ = ctrlconv[(unsigned char)*str]; + str++; } while (--n); *p = '\0'; - printf("%s%s%s", HIGHLIGHT, buf, NORMAL); + print_hilite(buf); } - puts(str); + printf("%s"CLEAR_2_EOL"\n", str); } /* Print the buffer */ @@ -413,12 +440,13 @@ static void buffer_print(void) { int i; - printf("%s", CLEAR); + move_cursor(0, 0); for (i = 0; i < height - 1; i++) if (pattern_valid) print_found(buffer[i]); else print_ascii(buffer[i]); + fputs(CLEAR_2_EOL, stdout); /* clears status line */ status_print(); } @@ -427,11 +455,6 @@ static void buffer_init(void) { int i; - if (!buffer) { - /* malloc the number of lines needed for the buffer */ - buffer = xmalloc(height * sizeof(char *)); - } - /* 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++) { @@ -491,18 +514,19 @@ static void buffer_line(int linenum) if (linenum < 0 || linenum > num_flines) { clear_line(); - printf("%s%s%i%s", HIGHLIGHT, "Cannot seek to line number ", linenum + 1, NORMAL); - } else { - for (i = 0; i < height - 1; i++) { - if (linenum + i <= num_flines) - buffer[i] = flines[linenum + i]; - else { - buffer[i] = empty_line_marker; - } + printf(HIGHLIGHT"%s%u"NORMAL, "Cannot seek to line ", linenum + 1); + return; + } + + for (i = 0; i < height - 1; i++) { + if (linenum + i <= num_flines) + buffer[i] = flines[linenum + i]; + else { + buffer[i] = empty_line_marker; } - line_pos = linenum; - buffer_print(); } + line_pos = linenum; + buffer_print(); } /* Reinitialise everything for a new file - free the memory and start over */ @@ -524,10 +548,13 @@ static void examine_file(void) clear_line(); printf("Examine: "); free(filename); - filename = xmalloc_getline(inp); + filename = tless_gets(); + /* files start by = argv. why we assume that argv is infinitely long?? files[num_files] = filename; current_file = num_files + 1; - num_files++; + num_files++; */ + files[0] = filename; + current_file = 1; reinitialise(); } @@ -545,7 +572,7 @@ static void change_file(int direction) reinitialise(); } else { clear_line(); - printf("%s%s%s", HIGHLIGHT, (direction > 0) ? "No next file" : "No previous file", NORMAL); + print_hilite((direction > 0) ? "No next file" : "No previous file"); } } @@ -628,7 +655,7 @@ static void goto_match(int match) static void regex_process(void) { - char *uncomp_regex; + char *uncomp_regex, *err; /* Reset variables */ match_lines = xrealloc(match_lines, sizeof(int)); @@ -643,16 +670,22 @@ static void regex_process(void) /* Get the uncompiled regular expression from the user */ clear_line(); putchar((option_mask32 & LESS_STATE_MATCH_BACKWARDS) ? '?' : '/'); - uncomp_regex = xmalloc_getline(inp); - if (!uncomp_regex || !uncomp_regex[0]) { + uncomp_regex = tless_gets(); + if (/*!uncomp_regex ||*/ !uncomp_regex[0]) { free(uncomp_regex); buffer_print(); return; } /* Compile the regex and check for errors */ - xregcomp(&pattern, uncomp_regex, 0); + err = regcomp_or_errmsg(&pattern, uncomp_regex, 0); free(uncomp_regex); + if (err) { + clear_line(); + fputs(err, stdout); + free(err); + return; + } pattern_valid = 1; /* Run the regex on each line of the current file */ @@ -799,7 +832,7 @@ static void show_flag_status(void) } clear_line(); - printf("%s%s%i%s", HIGHLIGHT, "The status of the flag is: ", flag_val != 0, NORMAL); + printf(HIGHLIGHT"%s%u"NORMAL, "The status of the flag is: ", flag_val != 0); } #endif @@ -820,12 +853,12 @@ static void save_input_to_file(void) clear_line(); printf("Log file: "); - current_line = xmalloc_getline(inp); + current_line = tless_gets(); if (strlen(current_line) > 0) { fp = fopen(current_line, "w"); free(current_line); if (!fp) { - printf("%s%s%s", HIGHLIGHT, "Error opening log file", NORMAL); + print_hilite("Error opening log file"); return; } for (i = 0; i < num_flines; i++) @@ -835,7 +868,7 @@ static void save_input_to_file(void) return; } free(current_line); - printf("%s%s%s", HIGHLIGHT, "No log file", NORMAL); + print_hilite("No log file"); } #if ENABLE_FEATURE_LESS_MARKS @@ -858,7 +891,7 @@ static void add_mark(void) num_marks++; } else { clear_line(); - printf("%s%s%s", HIGHLIGHT, "Invalid mark letter", NORMAL); + print_hilite("Invalid mark letter"); } } @@ -878,10 +911,10 @@ static void goto_mark(void) buffer_line(mark_lines[i][1]); break; } - if ((num_marks == 14) && (letter != mark_lines[14][0])) - printf("%s%s%s", HIGHLIGHT, "Mark not set", NORMAL); + if (num_marks == 14 && letter != mark_lines[14][0]) + print_hilite("Mark not set"); } else - printf("%s%s%s", HIGHLIGHT, "Invalid mark letter", NORMAL); + print_hilite("Invalid mark letter"); } #endif @@ -911,21 +944,19 @@ static void match_right_bracket(char bracket) clear_line(); - if (strchr(flines[line_pos], bracket) == NULL) - printf("%s%s%s", HIGHLIGHT, "No bracket in top line", NORMAL); - else { - for (i = line_pos + 1; i < num_flines; i++) { - if (strchr(flines[i], opp_bracket(bracket)) != NULL) { - bracket_line = i; - break; - } + if (strchr(flines[line_pos], bracket) == NULL) { + print_hilite("No bracket in top line"); + return; + } + for (i = line_pos + 1; i < num_flines; i++) { + if (strchr(flines[i], opp_bracket(bracket)) != NULL) { + bracket_line = i; + break; } - - if (bracket_line == -1) - printf("%s%s%s", HIGHLIGHT, "No matching bracket found", NORMAL); - - buffer_line(bracket_line - height + 2); } + if (bracket_line == -1) + print_hilite("No matching bracket found"); + buffer_line(bracket_line - height + 2); } static void match_left_bracket(char bracket) @@ -936,22 +967,22 @@ static void match_left_bracket(char bracket) clear_line(); if (strchr(flines[line_pos + height - 2], bracket) == NULL) { - printf("%s%s%s", HIGHLIGHT, "No bracket in bottom line", NORMAL); - printf("%s", flines[line_pos + height]); - sleep(4); - } else { - for (i = line_pos + height - 2; i >= 0; i--) { - if (strchr(flines[i], opp_bracket(bracket)) != NULL) { - bracket_line = i; - break; - } - } - - if (bracket_line == -1) - printf("%s%s%s", HIGHLIGHT, "No matching bracket found", NORMAL); + print_hilite("No bracket in bottom line"); + /* ?? */ + /*printf("%s", flines[line_pos + height]);*/ + /*sleep(4);*/ + return; + } - buffer_line(bracket_line); + for (i = line_pos + height - 2; i >= 0; i--) { + if (strchr(flines[i], opp_bracket(bracket)) != NULL) { + bracket_line = i; + break; + } } + if (bracket_line == -1) + print_hilite("No matching bracket found"); + buffer_line(bracket_line); } #endif /* FEATURE_LESS_BRACKETS */ @@ -959,7 +990,7 @@ static void match_left_bracket(char bracket) static void keypress_process(int keypress) { switch (keypress) { - case KEY_DOWN: case 'e': case 'j': case '\015': + case KEY_DOWN: case 'e': case 'j': case 0x0d: buffer_down(1); buffer_print(); break; @@ -1080,37 +1111,42 @@ int less_main(int argc, char **argv) files = argv; num_files = argc; + /* Another popular pager, most, detects when stdout + * is not a tty and turns into cat. This makes sense. */ + if (!isatty(STDOUT_FILENO)) + return bb_cat(argv); + if (!num_files) { if (isatty(STDIN_FILENO)) { - /* Just "less"? No file and no redirection? */ + /* Just "less"? No args and no redirection? */ bb_error_msg("missing filename"); bb_show_usage(); } } else filename = xstrdup(files[0]); - /* FIXME: another popular pager, most, detects when stdout - * is not a tty and turns into cat */ inp = xfopen(CURRENT_TTY, "r"); get_terminal_width_height(fileno(inp), &width, &height); if (width < 10 || height < 3) bb_error_msg_and_die("too narrow here"); - if (option_mask32 & FLAG_TILDE) empty_line_marker = ""; + buffer = xmalloc(height * sizeof(char *)); + if (option_mask32 & FLAG_TILDE) + empty_line_marker = ""; data_readlines(); tcgetattr(fileno(inp), &term_orig); signal(SIGTERM, sig_catcher); signal(SIGINT, sig_catcher); - 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; + buffer_init(); buffer_print(); -- cgit v1.2.3