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authorDenis Vlasenko <vda.linux@googlemail.com>2008-10-23 22:02:30 +0000
committerDenis Vlasenko <vda.linux@googlemail.com>2008-10-23 22:02:30 +0000
commit8f39b72aba3fbb360ea46c6124c9ac90e54372f6 (patch)
treed906a485b128ed12be69f75b096f9f3475b1dba3 /miscutils
parent2dfd295726a0e71c5901214b78cc13a0775a4102 (diff)
downloadbusybox-8f39b72aba3fbb360ea46c6124c9ac90e54372f6.tar.gz
less: more sane way of line numbering. Prepares for
wrap/unwrap and line numbers to be toggleable.
Diffstat (limited to 'miscutils')
-rw-r--r--miscutils/less.c75
1 files changed, 53 insertions, 22 deletions
diff --git a/miscutils/less.c b/miscutils/less.c
index cd47590ee..049814319 100644
--- a/miscutils/less.c
+++ b/miscutils/less.c
@@ -166,6 +166,14 @@ struct globals {
USE_FEATURE_LESS_REGEXP(wanted_match = -1;) \
} while (0)
+/* flines[] are lines read from stdin, each in malloc'ed buffer.
+ * Line numbers are stored as uint32_t prepended to each line.
+ * Pointer is adjusted so that flines[i] points directly past
+ * line number. Accesor: */
+#define MEMPTR(p) ((char*)(p) - 4)
+#define LINENO(p) (*(uint32_t*)((p) - 4))
+
+
/* Reset terminal input to normal */
static void set_tty_cooked(void)
{
@@ -252,15 +260,13 @@ static void read_lines(void)
USE_FEATURE_LESS_REGEXP(again0:)
- p = current_line = xmalloc(w);
+ p = current_line = ((char*)xmalloc(w + 4)) + 4;
max_fline += last_terminated;
if (!last_terminated) {
const char *cp = flines[max_fline];
- if (option_mask32 & FLAG_N)
- cp += 8;
- strcpy(current_line, cp);
+ strcpy(p, cp);
p += strlen(current_line);
- free((char*)flines[max_fline]);
+ free(MEMPTR(flines[max_fline]));
/* linepos is still valid from previous read_lines() */
} else {
linepos = 0;
@@ -324,17 +330,12 @@ static void read_lines(void)
reached_eof:
last_terminated = terminated;
flines = xrealloc_vector(flines, 8, max_fline);
- if (option_mask32 & FLAG_N) {
- /* Width of 7 preserves tab spacing in the text */
- flines[max_fline] = xasprintf(
- (max_lineno <= 9999999) ? "%7u %s" : "%07u %s",
- max_lineno % 10000000, current_line);
- free(current_line);
- if (terminated)
- max_lineno++;
- } else {
- flines[max_fline] = xrealloc(current_line, strlen(current_line) + 1);
- }
+
+ flines[max_fline] = (char*)xrealloc(MEMPTR(current_line), strlen(current_line) + 1 + 4) + 4;
+ LINENO(flines[max_fline]) = max_lineno;
+ if (terminated)
+ max_lineno++;
+
if (max_fline >= MAXLINES) {
eof_error = 0; /* Pretend we saw EOF */
break;
@@ -380,7 +381,7 @@ static void read_lines(void)
#endif
}
max_fline++;
- current_line = xmalloc(w);
+ current_line = ((char*)xmalloc(w + 4)) + 4;
p = current_line;
linepos = 0;
} /* end of "read lines until we reach cur_fline" loop */
@@ -487,6 +488,30 @@ static const char ctrlconv[] ALIGN1 =
"\x40\x41\x42\x43\x44\x45\x46\x47\x48\x49\x40\x4b\x4c\x4d\x4e\x4f"
"\x50\x51\x52\x53\x54\x55\x56\x57\x58\x59\x5a\x5b\x5c\x5d\x5e\x5f";
+static void lineno_str(char *nbuf9, const char *line)
+{
+ nbuf9[0] = '\0';
+ if (option_mask32 & FLAG_N) {
+ const char *fmt;
+ unsigned n;
+
+ if (line == empty_line_marker) {
+ memset(nbuf9, ' ', 8);
+ nbuf9[8] = '\0';
+ return;
+ }
+ /* Width of 7 preserves tab spacing in the text */
+ fmt = "%7u ";
+ n = LINENO(line);
+ if (n > 9999999) {
+ n %= 10000000;
+ fmt = "%07u ";
+ }
+ sprintf(nbuf9, fmt, n);
+ }
+}
+
+
#if ENABLE_FEATURE_LESS_REGEXP
static void print_found(const char *line)
{
@@ -496,6 +521,7 @@ static void print_found(const char *line)
regmatch_t match_structs;
char buf[width];
+ char nbuf9[9];
const char *str = line;
char *p = buf;
size_t n;
@@ -532,7 +558,8 @@ static void print_found(const char *line)
match_structs.rm_so, str,
match_structs.rm_eo - match_structs.rm_so,
str + match_structs.rm_so);
- free(growline); growline = new;
+ free(growline);
+ growline = new;
str += match_structs.rm_eo;
line += match_structs.rm_eo;
eflags = REG_NOTBOL;
@@ -544,11 +571,12 @@ static void print_found(const char *line)
match_status = 1;
}
+ lineno_str(nbuf9, line);
if (!growline) {
- printf(CLEAR_2_EOL"%s\n", str);
+ printf(CLEAR_2_EOL"%s%s\n", nbuf9, str);
return;
}
- printf(CLEAR_2_EOL"%s%s\n", growline, str);
+ printf(CLEAR_2_EOL"%s%s%s\n", nbuf9, growline, str);
free(growline);
}
#else
@@ -558,10 +586,13 @@ void print_found(const char *line);
static void print_ascii(const char *str)
{
char buf[width];
+ char nbuf9[9];
char *p;
size_t n;
- printf(CLEAR_2_EOL);
+ lineno_str(nbuf9, str);
+ printf(CLEAR_2_EOL"%s", nbuf9);
+
while (*str) {
n = strcspn(str, controls);
if (n) {
@@ -670,7 +701,7 @@ static void reinitialize(void)
if (flines) {
for (i = 0; i <= max_fline; i++)
- free((void*)(flines[i]));
+ free(MEMPTR(flines[i]));
free(flines);
flines = NULL;
}