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-rw-r--r--miscutils/less.c250
1 files changed, 106 insertions, 144 deletions
diff --git a/miscutils/less.c b/miscutils/less.c
index d7898ca..3fd22ca 100644
--- a/miscutils/less.c
+++ b/miscutils/less.c
@@ -89,8 +89,8 @@ static int height;
static int width;
static char **files;
static char filename[256];
-static char buffer[100][256];
-static char *flines[MAXLINES];
+static char **buffer;
+static char **flines;
static int current_file = 1;
static int line_pos;
static int num_flines;
@@ -98,11 +98,12 @@ static int num_files = 1;
static int past_eof;
/* Command line options */
-static int E_FLAG;
-static int M_FLAG;
-static int N_FLAG;
-static int m_FLAG;
-static int TILDE_FLAG;
+static unsigned long flags;
+#define FLAG_E 1
+#define FLAG_M (1<<1)
+#define FLAG_m (1<<2)
+#define FLAG_N (1<<3)
+#define FLAG_TILDE (1<<4)
/* This is needed so that program behaviour changes when input comes from
stdin */
@@ -139,7 +140,7 @@ static void set_tty_cooked(void) {
tcsetattr(0, TCSANOW, &term_orig);
}
-/* Set terminal input to raw mode */
+/* Set terminal input to raw mode (taken from vi.c) */
static void set_tty_raw(void) {
tcgetattr(0, &term_orig);
term_vi = term_orig;
@@ -221,8 +222,8 @@ static void add_linenumbers(void) {
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);
+ flines[i] = xrealloc(flines[i], strlen(current_line) + 7);
+ sprintf(flines[i],"%5d %s", i + 1, current_line);
}
}
@@ -234,6 +235,13 @@ static void data_readlines(void) {
fp = (inp_stdin) ? stdin : bb_xfopen(filename, "rt");
+ /* First of all, we need to know the number of lines so that flines can be initialised. */
+ for (i = 0; (!feof(fp)) && (i <= MAXLINES); i++)
+ fgets(current_line, 256, fp);
+ rewind(fp);
+ /* Initialise fp */
+ flines = malloc(i * sizeof(char *));
+
for (i = 0; (!feof(fp)) && (i <= MAXLINES); i++) {
strcpy(current_line, "");
fgets(current_line, 256, fp);
@@ -249,36 +257,17 @@ static void data_readlines(void) {
fclose(fp);
- if (inp_stdin)
- inp = fopen(CURRENT_TTY, "r");
- else
- inp = stdin;
-
+ inp = (inp_stdin) ? fopen(CURRENT_TTY, "r") : stdin;
+
if (ea_inp_stdin) {
fclose(inp);
inp = fopen(CURRENT_TTY, "r");
}
- if (N_FLAG)
+ if (flags & FLAG_N)
add_linenumbers();
}
-/* Free the file data */
-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 */
-static int calc_percent(void) {
- return ((100 * (line_pos + height - 2) / num_flines) + 1);
-}
-#endif
-
/* Turn a percentage into a line number */
static int reverse_percent(int percentage) {
double linenum = percentage;
@@ -287,6 +276,13 @@ static int reverse_percent(int percentage) {
}
#ifdef CONFIG_FEATURE_LESS_FLAGS
+
+/* Interestingly, writing calc_percent as a function and not a prototype saves around 32 bytes
+ * on my build. */
+static int calc_percent(void) {
+ return ((100 * (line_pos + height - 2) / num_flines) + 1);
+}
+
/* Print a status line if -M was specified */
static void m_status_print(void) {
@@ -342,9 +338,9 @@ static void status_print(void) {
/* Change the status if flags have been set */
#ifdef CONFIG_FEATURE_LESS_FLAGS
- if (M_FLAG)
+ if (flags & FLAG_M)
m_status_print();
- else if (m_FLAG)
+ else if (flags & FLAG_m)
medium_status_print();
/* No flags set */
else {
@@ -377,7 +373,6 @@ static void buffer_print(void) {
move_cursor(0,0);
for (i = 0; i < height - 1; i++)
printf("%s", buffer[i]);
- status_print();
}
else {
printf("%s", CLEAR);
@@ -386,8 +381,9 @@ static void buffer_print(void) {
putchar('\n');
for (i = 0; i < height - 1; i++)
printf("%s", buffer[i]);
- status_print();
}
+
+ status_print();
}
/* Initialise the buffer */
@@ -395,18 +391,18 @@ static void buffer_init(void) {
int i;
- for (i = 0; i < (height - 1); i++)
- memset(buffer[i], '\0', 256);
-
+ /* malloc the number of lines needed for the buffer */
+ buffer = xrealloc(buffer, 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++) {
- strcpy(buffer[i], flines[i]);
+ buffer[i] = (char *) bb_xstrdup(flines[i]);
}
/* If the buffer still isn't full, fill it with blank lines */
for (; i < (height - 1); i++) {
- strcpy(buffer[i], "");
+ buffer[i] = "";
}
}
@@ -419,7 +415,7 @@ static void buffer_down(int nlines) {
if (line_pos + (height - 3) + nlines < num_flines) {
line_pos += nlines;
for (i = 0; i < (height - 1); i++)
- strcpy(buffer[i], flines[line_pos + i]);
+ buffer[i] = (char *) bb_xstrdup(flines[line_pos + i]);
}
else {
/* As the number of lines requested was too large, we just move
@@ -427,12 +423,12 @@ static void buffer_down(int nlines) {
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]);
+ buffer[i] = (char *) bb_xstrdup(flines[line_pos + i]);
}
}
/* We exit if the -E flag has been set */
- if (E_FLAG && (line_pos + (height - 2) == num_flines))
+ if ((flags & FLAG_E) && (line_pos + (height - 2) == num_flines))
tless_exit(0);
}
}
@@ -446,7 +442,7 @@ static void buffer_up(int nlines) {
if (line_pos - nlines >= 0) {
line_pos -= nlines;
for (i = 0; i < (height - 1); i++)
- strcpy(buffer[i], flines[line_pos + i]);
+ buffer[i] = (char *) bb_xstrdup(flines[line_pos + i]);
}
else {
/* As the requested number of lines to move was too large, we
@@ -454,7 +450,7 @@ static void buffer_up(int nlines) {
while (line_pos != 0) {
line_pos -= 1;
for (i = 0; i < (height - 1); i++)
- strcpy(buffer[i], flines[line_pos + i]);
+ buffer[i] = (char *) bb_xstrdup(flines[line_pos + i]);
}
}
}
@@ -474,10 +470,10 @@ static void buffer_up(int nlines) {
is past the EOF */
for (i = 0; i < (height - 1); i++) {
if (i < tilde_line - nlines + 1)
- strcpy(buffer[i], flines[line_pos + i]);
+ buffer[i] = (char *) bb_xstrdup(flines[line_pos + i]);
else {
if (line_pos >= num_flines - height + 2)
- strcpy(buffer[i], "~\n");
+ buffer[i] = "~\n";
}
}
}
@@ -496,15 +492,15 @@ static void buffer_line(int linenum) {
}
else if (linenum < (num_flines - height - 2)) {
for (i = 0; i < (height - 1); i++)
- strcpy(buffer[i], flines[linenum + i]);
+ buffer[i] = (char *) bb_xstrdup(flines[linenum + i]);
line_pos = linenum;
}
else {
for (i = 0; i < (height - 1); i++) {
if (linenum + i < num_flines + 2)
- strcpy(buffer[i], flines[linenum + i]);
+ buffer[i] = (char *) bb_xstrdup(flines[linenum + i]);
else
- strcpy(buffer[i], (TILDE_FLAG) ? "\n" : "~\n");
+ buffer[i] = (char *) bb_xstrdup((flags & FLAG_TILDE) ? "\n" : "~\n");
}
line_pos = linenum;
/* Set past_eof so buffer_down and buffer_up act differently */
@@ -512,6 +508,20 @@ static void buffer_line(int linenum) {
}
}
+/* Reinitialise everything for a new file - free the memory and start over */
+static void reinitialise(void) {
+
+ int i;
+
+ for (i = 0; i <= num_flines; i++)
+ free(flines[i]);
+ free(flines);
+
+ data_readlines();
+ buffer_init();
+ buffer_print();
+}
+
static void examine_file(void) {
int newline_offset;
@@ -531,52 +541,23 @@ static void examine_file(void) {
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);
- }
+ reinitialise();
}
-static void previous_file(void) {
- if (current_file != 1) {
- current_file--;
+/* This function changes the file currently being paged. direction can be one of the following:
+ * -1: go back one file
+ * 0: go to the first file
+ * 1: go forward one file
+*/
+static void change_file (int direction) {
+ if (current_file != ((direction > 0) ? num_files : 1)) {
+ current_file = direction ? current_file + direction : 1;
strcpy(filename, files[current_file - 1]);
-
- free_flines();
- data_readlines();
- buffer_init();
- buffer_print();
+ reinitialise();
}
else {
clear_line();
- printf("%s%s%s", HIGHLIGHT, "No previous file", NORMAL);
- }
-}
-
-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();
+ printf("%s%s%s", HIGHLIGHT, (direction > 0) ? "No next file" : "No previous file", NORMAL);
}
}
@@ -585,14 +566,14 @@ static void remove_current_file(void) {
int i;
if (current_file != 1) {
- previous_file();
+ change_file(-1);
for (i = 3; i <= num_files; i++)
files[i - 2] = files[i - 1];
num_files--;
buffer_print();
}
else {
- next_file();
+ change_file(1);
for (i = 2; i <= num_files; i++)
files[i - 2] = files[i - 1];
num_files--;
@@ -624,16 +605,16 @@ static void colon_process(void) {
break;
#endif
case 'n':
- next_file();
+ change_file(1);
break;
case 'p':
- previous_file();
+ change_file(-1);
break;
case 'q':
tless_exit(0);
break;
case 'x':
- first_file();
+ change_file(0);
break;
default:
break;
@@ -715,10 +696,7 @@ static void regex_process(void) {
/* Get the uncompiled regular expression from the user */
clear_line();
- if (match_backwards)
- printf("?");
- else
- printf("/");
+ putchar((match_backwards) ? '?' : '/');
scanf("%s", uncomp_regex);
/* Compile the regex and check for errors */
@@ -728,7 +706,6 @@ static void regex_process(void) {
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++;
@@ -789,7 +766,7 @@ static void number_process(int first_digit) {
/* Receive input until a letter is given */
while((num_input[i] = tless_getch()) && isdigit(num_input[i])) {
- printf("%c",num_input[i]);
+ printf("%c", num_input[i]);
i++;
}
@@ -803,40 +780,35 @@ static void number_process(int first_digit) {
switch (keypress) {
case KEY_DOWN: case 'z': case 'd': case 'e': case ' ': case '\015':
buffer_down(num);
- buffer_print();
break;
case KEY_UP: case 'b': case 'w': case 'y': case 'u':
buffer_up(num);
- buffer_print();
break;
case 'g': case '<': case 'G': case '>':
if (num_flines >= height - 2)
buffer_line(num - 1);
- buffer_print();
break;
case 'p': case '%':
buffer_line(reverse_percent(num));
- buffer_print();
break;
#ifdef CONFIG_FEATURE_LESS_REGEXP
case 'n':
goto_match(match_pos + num - 1);
- buffer_print();
break;
case '/':
regex_process();
goto_match(num - 1);
- buffer_print();
break;
case '?':
num_back_match = num;
search_backwards();
- buffer_print();
break;
#endif
default:
break;
}
+
+ buffer_print();
}
#ifdef CONFIG_FEATURE_LESS_FLAGCS
@@ -845,21 +817,21 @@ static void flag_change(void) {
int keypress;
clear_line();
- printf("-");
+ putchar('-');
keypress = tless_getch();
switch (keypress) {
case 'M':
- M_FLAG = !M_FLAG;
+ flags &= ~FLAG_M;
break;
case 'm':
- m_FLAG = !m_FLAG;
+ flags &= ~FLAG_m;
break;
case 'E':
- E_FLAG = !E_FLAG;
+ flags &= ~FLAG_E;
break;
case '~':
- TILDE_FLAG = !TILDE_FLAG;
+ flags &= ~FLAG_TILDE;
break;
default:
break;
@@ -872,24 +844,24 @@ static void show_flag_status(void) {
int flag_val;
clear_line();
- printf("_");
+ putchar('_');
keypress = tless_getch();
switch (keypress) {
case 'M':
- flag_val = M_FLAG;
+ flag_val = flags & FLAG_M;
break;
case 'm':
- flag_val = m_FLAG;
+ flag_val = flags & FLAG_m;
break;
case '~':
- flag_val = TILDE_FLAG;
+ flag_val = flags & FLAG_TILDE;
break;
case 'N':
- flag_val = N_FLAG;
+ flag_val = flags & FLAG_N;
break;
case 'E':
- flag_val = E_FLAG;
+ flag_val = flags & FLAG_E;
break;
default:
flag_val = 0;
@@ -897,7 +869,7 @@ 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("%s%s%i%s", HIGHLIGHT, "The status of the flag is: ", flag_val, NORMAL);
}
#endif
@@ -967,21 +939,19 @@ static void goto_mark(void) {
clear_line();
printf("Go to mark: ");
letter = tless_getch();
+ clear_line();
+
if (isalpha(letter)) {
for (i = 0; i <= num_marks; i++)
if (letter == mark_lines[i][0]) {
buffer_line(mark_lines[i][1]);
break;
}
- if ((num_marks == 14) && (letter != mark_lines[14][0])) {
- clear_line();
+ if ((num_marks == 14) && (letter != mark_lines[14][0]))
printf("%s%s%s", HIGHLIGHT, "Mark not set", NORMAL);
- }
}
- else {
- clear_line();
+ else
printf("%s%s%s", HIGHLIGHT, "Invalid mark letter", NORMAL);
- }
}
#endif
@@ -1014,10 +984,10 @@ static void match_right_bracket(char bracket) {
int bracket_line = -1;
int i;
- if (strchr(flines[line_pos], bracket) == NULL) {
- clear_line();
+ 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) {
@@ -1026,10 +996,8 @@ static void match_right_bracket(char bracket) {
}
}
- if (bracket_line == -1) {
- clear_line();
+ if (bracket_line == -1)
printf("%s%s%s", HIGHLIGHT, "No matching bracket found", NORMAL);
- }
buffer_line(bracket_line - height + 2);
buffer_print();
@@ -1041,8 +1009,9 @@ static void match_left_bracket (char bracket) {
int bracket_line = -1;
int i;
+ clear_line();
+
if (strchr(flines[line_pos + height - 2], bracket) == NULL) {
- clear_line();
printf("%s%s%s", HIGHLIGHT, "No bracket in bottom line", NORMAL);
printf("%s", flines[line_pos + height]);
sleep(4);
@@ -1055,10 +1024,8 @@ static void match_left_bracket (char bracket) {
}
}
- if (bracket_line == -1) {
- clear_line();
+ if (bracket_line == -1)
printf("%s%s%s", HIGHLIGHT, "No matching bracket found", NORMAL);
- }
buffer_line(bracket_line);
buffer_print();
@@ -1174,21 +1141,16 @@ static void keypress_process(int keypress) {
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);
- N_FLAG = (flags & 4);
- m_FLAG = (flags & 8);
- TILDE_FLAG = (flags & 16);
+ flags = bb_getopt_ulflags(argc, argv, "EMmN~");
argc -= optind;
argv += optind;
generated by cgit v1.1 at 2024-12-27 05:37:54 +0000