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authorDamon Chaplin <damon@ximian.com>2001-10-31 19:17:42 +0800
committerDamon Chaplin <damon@src.gnome.org>2001-10-31 19:17:42 +0800
commit3f5027009a8d22f271be69562633ecb2233a6418 (patch)
treecb1734335ea12b6f0fe5fa6fd67e760223a1fc48
parent1a54303e49a9f870f48031ffe54fcf480ac56d6f (diff)
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had to redo the folding code since Outlook 2000 doesn't like parameter
2001-10-31 Damon Chaplin <damon@ximian.com> * src/libical/icalproperty.c (icalproperty_as_ical_string): had to redo the folding code since Outlook 2000 doesn't like parameter values like 'TENTATIVE' cut in half. Now it tries to split after a ';', ':' or space. svn path=/trunk/; revision=14529
-rw-r--r--libical/ChangeLog7
-rw-r--r--libical/src/libical/icalproperty.c111
2 files changed, 86 insertions, 32 deletions
diff --git a/libical/ChangeLog b/libical/ChangeLog
index 066d625076..44cc7bef5d 100644
--- a/libical/ChangeLog
+++ b/libical/ChangeLog
@@ -1,3 +1,10 @@
+2001-10-31 Damon Chaplin <damon@ximian.com>
+
+ * src/libical/icalproperty.c (icalproperty_as_ical_string): had to
+ redo the folding code since Outlook 2000 doesn't like parameter values
+ like 'TENTATIVE' cut in half. Now it tries to split after a ';', ':'
+ or space.
+
2001-10-30 Damon Chaplin <damon@ximian.com>
* src/libical/icalproperty.c (fold_property_line): forgot to account
diff --git a/libical/src/libical/icalproperty.c b/libical/src/libical/icalproperty.c
index 331443e3dd..bd361aecc2 100644
--- a/libical/src/libical/icalproperty.c
+++ b/libical/src/libical/icalproperty.c
@@ -263,51 +263,91 @@ icalproperty_free (icalproperty* prop)
}
-/* This splits the property every 75 octects, as described in the spec.
+/* This returns where the start of the next line should be. chars_left does
+ not include the trailing '\0'. */
+static char*
+get_next_line_start (char *line_start, int chars_left)
+{
+ char *pos;
+
+ /* If we have 74 chars or less left, we can output all of them.
+ we return a pointer to the '\0' at the end of the string. */
+ if (chars_left <= 74) {
+ return line_start + chars_left;
+ }
+
+ /* Now we jump to the last possible character of the line, and step back
+ trying to find a ';' ':' or ' '. If we find one, we return the character
+ after it. If not, we break at 74 chars (the 75th char is the space at
+ the start of the line). */
+ pos = line_start + 73;
+ while (pos > line_start) {
+ if (*pos == ';' || *pos == ':' || *pos == ' ') {
+ return pos + 1;
+ }
+ pos--;
+ }
+
+ return line_start + 74;
+}
+
+
+/* This splits the property into lines less than 75 octects long (as specified
+ in RFC2445). It tries to split after a ';' if it can.
It returns a tmp buffer.
NOTE: I'm not sure if it matters if we split a line in the middle of a
UTF-8 character. It probably won't look nice in a text editor. */
static char*
fold_property_line (char *text)
{
- int len, max_lines, line_length, buf_len;
- char *buf, *src, *dest, ch;
+ size_t buf_size;
+ char *buf, *buf_ptr, *line_start, *next_line_start, *out_buf;
+ int len, chars_left, first_line;
+ char ch;
+ /* Start with a buffer twice the size of our property line, so we almost
+ certainly won't overflow it. */
len = strlen (text);
-
- /* The minimum length we split a line at is 65 characters, so calculate
- the maximum number of newlines we will need. */
- max_lines = len / 65;
-
- /* Calculate the maximum size for the buffer we need, if we add a newline
- and a space character for each line, and a '\0' at the end. */
- buf_len = len + (max_lines * 2);
- buf = icalmemory_tmp_buffer (buf_len + 1);
-
- src = text;
- dest = buf;
- line_length = 0;
- while (ch = *src) {
- /* If the line is 65 characters or over, try to split at next space.
- If it is 75 characters or over, split now. */
- if ((line_length >= 65 && ch == ' ') || (line_length >= 75)) {
- *dest++ = '\n';
- *dest++ = ' ';
- line_length = 0;
+ buf_size = len * 2;
+ buf = icalmemory_new_buffer (buf_size);
+ buf_ptr = buf;
+
+ /* Step through the text, finding each line to add to the output. */
+ line_start = text;
+ chars_left = len;
+ first_line = 1;
+ for (;;) {
+ if (chars_left <= 0)
+ break;
+
+ /* This returns the first character for the next line. */
+ next_line_start = get_next_line_start (line_start, chars_left);
+
+ /* If this isn't the first line, we need to output a newline and space
+ first. */
+ if (!first_line) {
+ icalmemory_append_string (&buf, &buf_ptr, &buf_size, "\n ");
}
+ first_line = 0;
- *dest++ = ch;
- line_length++;
-
- src++;
+ /* This adds the line to our tmp buffer. We temporarily place a '\0'
+ in text, so we can copy the line in one go. */
+ ch = *next_line_start;
+ *next_line_start = '\0';
+ icalmemory_append_string (&buf, &buf_ptr, &buf_size, line_start);
+ *next_line_start = ch;
- if (dest - buf > buf_len) {
- icalerror_warn ("Buffer overflow.");
- }
+ /* Now we move on to the next line. */
+ chars_left -= (next_line_start - line_start);
+ line_start = next_line_start;
}
- *dest = '\0';
- return buf;
+ /* Copy it to a temporary buffer, and then free it. */
+ out_buf = icalmemory_tmp_buffer (strlen (buf) + 1);
+ strcpy (out_buf, buf);
+ icalmemory_free_buffer (buf);
+
+ return out_buf;
}
@@ -459,6 +499,13 @@ icalproperty_as_ical_string (icalproperty* prop)
/* We now use a function to fold the line properly every 75 characters. */
out_buf = fold_property_line (buf);
+ /* This is useful for testing. It outputs the property before and after
+ folding, but only if it was changed. */
+#if 0
+ if (strcmp (buf, out_buf))
+ printf ("Property:\n%sFolded:\n%s", buf, out_buf);
+#endif
+
/*out_buf = icalmemory_tmp_buffer(strlen(buf)+1);*/
/*strcpy(out_buf, buf);*/