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Diffstat (limited to 'miscutils/less.c')
-rw-r--r--miscutils/less.c256
1 files changed, 146 insertions, 110 deletions
diff --git a/miscutils/less.c b/miscutils/less.c
index 6843ddd..068c3f3 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();
generated by cgit v1.1 at 2024-12-26 16:24:24 +0000