Emit NORMAL at newlines, like less, to deal with malformed input.
---
Fits a little akwardly into the output flow with a break and continue,
but it works.
miscutils/less.c | 54 +++++++++++++++++++++++++++---------------------
1 file changed, 30 insertions(+), 24 deletions(-)
diff --git a/miscutils/less.c b/miscutils/less.c
index 8a0525cb7..392a3ef3c 100644
--- a/miscutils/less.c
+++ b/miscutils/less.c
@@ -139,7 +139,7 @@
//usage: "\n -S Truncate long lines"
//usage: )
//usage: IF_FEATURE_LESS_RAW(
-//usage: "\n -R Remove color escape codes in input"
+//usage: "\n -R Keep ANSI color escape codes in input"
//usage: )
//usage: "\n -~ Suppress ~s displayed past EOF"
@@ -229,9 +229,6 @@ struct globals {
regex_t pattern;
smallint pattern_valid;
#endif
-#if ENABLE_FEATURE_LESS_RAW
- smallint in_escape;
-#endif
#if ENABLE_FEATURE_LESS_ASK_TERMINAL
smallint winsize_err;
#endif
@@ -541,26 +538,6 @@ static void read_lines(void)
*--p = '\0';
continue;
}
-#if ENABLE_FEATURE_LESS_RAW
- if (option_mask32 & FLAG_R) {
- if (c == '\033')
- goto discard;
- if (G.in_escape) {
- if (isdigit(c)
- || c == '['
- || c == ';'
- || c == 'm'
- ) {
- discard:
- G.in_escape = (c != 'm');
- readpos++;
- continue;
- }
- /* Hmm, unexpected end of "ESC [ N ; N
m" sequence */
- G.in_escape = 0;
- }
- }
-#endif
{
size_t new_last_line_pos = last_line_pos + 1;
if (c == '\t') {
@@ -780,6 +757,7 @@ static const char ctrlconv[] ALIGN1 =
* '\n' is a former NUL - we subst it with @, not J */
"\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 const char colctrl[] ALIGN1 = "\x1b[0123456789;m";
static void print_lineno(const char *line)
{
@@ -864,13 +842,32 @@ static void print_found(const char *line)
void print_found(const char *line);
#endif
+static size_t count_colctrl(const char *str) {
+ size_t n = strspn(str, colctrl);
+ // must end with m, need at least '<ESC>[m'
+ if (n < 3 || *(str+n-1) != 'm')
+ return 0;
+ return n;
+}
+
static void print_ascii(const char *str)
{
char buf[width+1];
char *p;
size_t n;
+#if ENABLE_FEATURE_LESS_RAW
+ size_t esc = 0;
+#endif
while (*str) {
+#if ENABLE_FEATURE_LESS_RAW
+ if (esc) {
+ printf("%.*s", (int) esc, str);
+ str += esc;
+ esc = 0;
+ continue;
+ }
+#endif
n = strcspn(str, controls);
if (n) {
if (!str[n]) break;
@@ -886,6 +883,14 @@ static void print_ascii(const char *str)
/* VT100's CSI, aka Meta-ESC. Who's inventor? */
/* I want to know who committed this sin */
*p++ = '{';
+#if ENABLE_FEATURE_LESS_RAW
+ else if ((option_mask32 & FLAG_R)
+ && *str == '\033'
+ // need at least '<ESC>[m'
+ && (esc = count_colctrl(str))) {
+ break;
+ }
+#endif
else
*p++ = ctrlconv[(unsigned char)*str];
str++;
@@ -894,6 +899,7 @@ static void print_ascii(const char *str)
print_hilite(buf);
}
puts(str);
+ printf(NORMAL);
}
/* Print the buffer */
--
2.35.2
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