Don't smash stack when $GIT_ALTERNATE_OBJECT_DIRECTORIES is too long

[git.git] / utf8.c

diff --git a/utf8.c b/utf8.c
index 8fa62571aa959897275e694a4370e99c46cccd6a..4efef6faf7c71f3201935f81611806af084c45d4 100644 (file)
--- a/utf8.c
+++ b/utf8.c
@@ -3,13 +3,15 @@
 
 /* This code is originally from http://www.cl.cam.ac.uk/~mgk25/ucs/ */
 
+typedef unsigned int ucs_char_t;  /* assuming 32bit int */
+
 struct interval {
   int first;
   int last;
 };
 
 /* auxiliary function for binary search in interval table */
-static int bisearch(wchar_t ucs, const struct interval *table, int max) {
+static int bisearch(ucs_char_t ucs, const struct interval *table, int max) {
        int min = 0;
        int mid;
 
@@ -56,11 +58,11 @@ static int bisearch(wchar_t ucs, const struct interval *table, int max) {
  *      ISO 8859-1 and WGL4 characters, Unicode control characters,
  *      etc.) have a column width of 1.
  *
- * This implementation assumes that wchar_t characters are encoded
+ * This implementation assumes that ucs_char_t characters are encoded
  * in ISO 10646.
  */
 
-static int wcwidth(wchar_t ch)
+static int git_wcwidth(ucs_char_t ch)
 {
        /*
         * Sorted list of non-overlapping intervals of non-spacing characters,
@@ -157,7 +159,7 @@ static int wcwidth(wchar_t ch)
 int utf8_width(const char **start)
 {
        unsigned char *s = (unsigned char *)*start;
-       wchar_t ch;
+       ucs_char_t ch;
 
        if (*s < 0x80) {
                /* 0xxxxxxx */
@@ -205,7 +207,7 @@ invalid:
                return 0;
        }
 
-       return wcwidth(ch);
+       return git_wcwidth(ch);
 }
 
 int is_utf8(const char *text)
@@ -235,12 +237,19 @@ static void print_spaces(int count)
 /*
  * Wrap the text, if necessary. The variable indent is the indent for the
  * first line, indent2 is the indent for all other lines.
+ * If indent is negative, assume that already -indent columns have been
+ * consumed (and no extra indent is necessary for the first line).
  */
-void print_wrapped_text(const char *text, int indent, int indent2, int width)
+int print_wrapped_text(const char *text, int indent, int indent2, int width)
 {
        int w = indent, assume_utf8 = is_utf8(text);
        const char *bol = text, *space = NULL;
 
+       if (indent < 0) {
+               w = -indent;
+               space = text;
+       }
+
        for (;;) {
                char c = *text;
                if (!c || isspace(c)) {
@@ -251,10 +260,9 @@ void print_wrapped_text(const char *text, int indent, int indent2, int width)
                                else
                                        print_spaces(indent);
                                fwrite(start, text - start, 1, stdout);
-                               if (!c) {
-                                       putchar('\n');
-                                       return;
-                               } else if (c == '\t')
+                               if (!c)
+                                       return w;
+                               else if (c == '\t')
                                        w |= 0x07;
                                space = text;
                                w++;
@@ -262,7 +270,7 @@ void print_wrapped_text(const char *text, int indent, int indent2, int width)
                        }
                        else {
                                putchar('\n');
-                               text = bol = space + 1;
+                               text = bol = space + isspace(*space);
                                space = NULL;
                                w = indent = indent2;
                        }
@@ -275,4 +283,74 @@ void print_wrapped_text(const char *text, int indent, int indent2, int width)
                        text++;
                }
        }
+       return w;
+}
+
+int is_encoding_utf8(const char *name)
+{
+       if (!name)
+               return 1;
+       if (!strcasecmp(name, "utf-8") || !strcasecmp(name, "utf8"))
+               return 1;
+       return 0;
+}
+
+/*
+ * Given a buffer and its encoding, return it re-encoded
+ * with iconv.  If the conversion fails, returns NULL.
+ */
+#ifndef NO_ICONV
+#ifdef OLD_ICONV
+       typedef const char * iconv_ibp;
+#else
+       typedef char * iconv_ibp;
+#endif
+char *reencode_string(const char *in, const char *out_encoding, const char *in_encoding)
+{
+       iconv_t conv;
+       size_t insz, outsz, outalloc;
+       char *out, *outpos;
+       iconv_ibp cp;
+
+       if (!in_encoding)
+               return NULL;
+       conv = iconv_open(out_encoding, in_encoding);
+       if (conv == (iconv_t) -1)
+               return NULL;
+       insz = strlen(in);
+       outsz = insz;
+       outalloc = outsz + 1; /* for terminating NUL */
+       out = xmalloc(outalloc);
+       outpos = out;
+       cp = (iconv_ibp)in;
+
+       while (1) {
+               size_t cnt = iconv(conv, &cp, &insz, &outpos, &outsz);
+
+               if (cnt == -1) {
+                       size_t sofar;
+                       if (errno != E2BIG) {
+                               free(out);
+                               iconv_close(conv);
+                               return NULL;
+                       }
+                       /* insz has remaining number of bytes.
+                        * since we started outsz the same as insz,
+                        * it is likely that insz is not enough for
+                        * converting the rest.
+                        */
+                       sofar = outpos - out;
+                       outalloc = sofar + insz * 2 + 32;
+                       out = xrealloc(out, outalloc);
+                       outpos = out + sofar;
+                       outsz = outalloc - sofar - 1;
+               }
+               else {
+                       *outpos = '\0';
+                       break;
+               }
+       }
+       iconv_close(conv);
+       return out;
 }
+#endif