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less: more sane way of line numbering. Prepares for

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wrap/unwrap and line numbers to be toggleable.
This commit is contained in:
Denis Vlasenko 2008-10-23 22:02:30 +00:00
parent 2dfd295726
commit 8f39b72aba
1 changed files with 53 additions and 22 deletions
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75
miscutils/less.c
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@ -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;
}