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[util] Add a means to open a gap in a text buffer

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for loading files into the buffer.
This commit is contained in:
Bill Currie 2020-03-22 20:19:25 +09:00
parent 63a2204fa5
commit 4dbf280012
2 changed files with 29 additions and 0 deletions
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14
include/QF/txtbuffer.h
View file

@ -59,6 +59,20 @@ txtbuffer_t *TextBuffer_Create (void);
*/
void TextBuffer_Destroy (txtbuffer_t *buffer);
/** Open a gap for writing at the specified offset.
Text after the offset is moved to be after the opened gap.
The buffer is resized as necessary.
\param buffer The buffer to be updated
\param offset The offset in the buffer at which to insert the text block
\param text_len The size of the gap to be opened
\return Pointr to beginning of gap if successful, 0 if failure
(offset not valid or out of memory)
*/
char *TextBuffer_OpenGap (txtbuffer_t *buffer, size_t offset,
size_t text_len);
/** Insert a block of text at the specified offset.
Text after the offset is moved to be after the inserted block of text.

15
libs/util/txtbuffer.c
View file

@ -159,6 +159,21 @@ TextBuffer_Destroy (txtbuffer_t *buffer)
FREE (txtbuffers, buffer);
}
VISIBLE char *
TextBuffer_OpenGap (txtbuffer_t *buffer, size_t offset, size_t text_len)
{
char *dst;
if (offset > buffer->textSize) {
return 0;
}
dst = txtbuffer_open_gap (buffer, offset, text_len);
if (!dst) {
return 0;
}
return dst;
}
VISIBLE int
TextBuffer_InsertAt (txtbuffer_t *buffer, size_t offset,
const char *text, size_t text_len)