From 2b999e614c48f084f6a14d589d434904aec6d491 Mon Sep 17 00:00:00 2001
From: Rob Landley <rob@landley.net>
Date: Tue, 15 Mar 2016 02:23:50 -0500
Subject: Add ls -b and make ls -q work with utf8.

---
 lib/linestack.c | 92 ++++++++++++++++++++++++++++++++++++---------------------
 1 file changed, 59 insertions(+), 33 deletions(-)

(limited to 'lib/linestack.c')

diff --git a/lib/linestack.c b/lib/linestack.c
index f8ca32a4..eef790b5 100644
--- a/lib/linestack.c
+++ b/lib/linestack.c
@@ -81,56 +81,75 @@ struct linestack *linestack_load(char *name)
 // if escout, send it unprintable chars, returns columns output or -1 for
 // standard escape: ^X if <32, <XX> if invliad UTF8, U+XXXX if UTF8 !iswprint()
 // Returns width in columns, moves *str to end of data consumed.
-int crunch_str(char **str, int width, FILE *out,
-  int (*escout)(FILE *out, int cols, char **buf))
+int crunch_str(char **str, int width, FILE *out, char *escmore,
+  int (*escout)(FILE *out, int cols, int wc))
 {
   int columns = 0, col, bytes;
   char *start, *end;
 
-  for (end = start = *str; *end;) {
-    wchar_t wc = *end;
+  for (end = start = *str; *end; columns += col, end += bytes) {
+    wchar_t wc;
 
-    bytes = 0;
-    if (*end >= ' ' && (bytes = mbrtowc(&wc, end, 99,0))>0
-        && (col = wcwidth(wc))>=0)
+    if ((bytes = mbrtowc(&wc, end, MB_CUR_MAX, 0))>0 && (col = wcwidth(wc))>=0)
     {
-      if (width-columns<col) break;
-      if (out) fwrite(end, bytes, 1, out);
-    } else if (!escout || 0>(col = escout(out, width-columns, &end))) {
-      char buf[32];
-
-      tty_esc("7m");
-      if (*end < ' ') {
-        bytes = 1;
-        sprintf(buf, "^%c", '@'+*end);
-      } else if (bytes<1) {
-        bytes = 1;
-        sprintf(buf, "<%02X>", *end);
-      } else sprintf(buf, "U+%04X", (unsigned)wc);
-      col = strlen(buf);
-      if (width-columns<col) buf[col = width-columns] = 0;
-      if (out) fputs(buf, out);
-      tty_esc("27m");
-    } else continue;
-    columns += col;
-    end += bytes;
+      if (!escmore || wc>255 || !strchr(escmore, wc)) {
+        if (width-columns<col) break;
+        if (out) fwrite(end, bytes, 1, out);
+
+        continue;
+      }
+    }
+
+    if (bytes<1) {
+      bytes = 1;
+      wc = *end;
+    }
+    col = width-columns;
+    if (col<1) break;
+    col = escout(out, col, wc);
   }
   *str = end;
 
   return columns;
 }
 
+int crunch_escape(FILE *out, int cols, int wc)
+{
+  char buf[8];
+  int rc;
+
+  if (wc<' ') rc = sprintf(buf, "^%c", '@'+wc);
+  else if (wc<256) rc = sprintf(buf, "<%02X>", wc);
+  else rc = sprintf(buf, "U+%04X", wc);
+
+  if (rc > cols) buf[rc = cols] = 0;
+  if (out) fputs(buf, out);
+
+  return rc;
+}
+
+int crunch_rev_escape(FILE *out, int cols, int wc)
+{
+  int rc;
+
+  tty_esc("7m");
+  rc = crunch_escape(out, cols, wc);
+  tty_esc("27m");
+
+  return rc;
+}
+
 // Write width chars at start of string to strdout with standard escapes
 // Returns length in columns so caller can pad it out with spaces.
 int draw_str(char *start, int width)
 {
-  return crunch_str(&start, width, stdout, 0);
+  return crunch_str(&start, width, stdout, 0, crunch_rev_escape);
 }
 
 // Return utf8 columns
 int utf8len(char *str)
 {
-  return crunch_str(&str, INT_MAX, 0, 0);
+  return crunch_str(&str, INT_MAX, 0, 0, crunch_rev_escape);
 }
 
 // Return bytes used by (up to) this many columns
@@ -138,14 +157,15 @@ int utf8skip(char *str, int width)
 {
   char *s = str;
 
-  crunch_str(&s, width, 0, 0);
+  crunch_str(&s, width, 0, 0, crunch_rev_escape);
 
   return s-str;
 }
 
-// Print utf8 to stdout with standard escapes,trimmed to width and padded
+// Print utf8 to stdout with standard escapes, trimmed to width and padded
 // out to padto. If padto<0 left justify. Returns columns printed
-int draw_trim(char *str, int padto, int width)
+int draw_trim_esc(char *str, int padto, int width, char *escmore,
+  int (*escout)(FILE *out, int cols, int wc))
 {
   int apad = abs(padto), len = utf8len(str);
 
@@ -154,8 +174,14 @@ int draw_trim(char *str, int padto, int width)
 
   // Left pad if right justified 
   if (padto>0 && apad>len) printf("%*s", apad-len, "");
-  crunch_str(&str, len, stdout, 0);
+  crunch_str(&str, len, stdout, 0, crunch_rev_escape);
   if (padto<0 && apad>len) printf("%*s", apad-len, "");
 
   return (apad > len) ? apad : len;
 }
+
+// draw_trim_esc() with default escape
+int draw_trim(char *str, int padto, int width)
+{
+  return draw_trim_esc(str, padto, width, 0, 0);
+}
-- 
cgit v1.2.3