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    commit 2e54a21b5ae249a6bcedab9db611ea86037a018b
    parent 289c52b7aa9b0e826bbea6f956755b3199b3ccac
    Author: Avi Halachmi (:avih) <avihpit@yahoo.com>
    Date:   Wed, 16 Oct 2019 12:55:53 +0300

    OSC 52 - copy to clipboard: don't limit to 382 bytes

    Strings which an application sends to the terminal in OSC, DCS, etc
    are typically small (title, colors, etc) but one exception is OSC 52
    which copies text to the clipboard, and is used for instance by tmux.

    Previously st cropped these strings at 512 bytes, which for OSC 52
    limited the copied text to 382 bytes (remaining buffer space before
    base64). This made it less useful than it can be.

    Now it's a dynamic growing buffer. It remains allocated after use,
    resets to 512 when a new string starts, or leaked on exit.

    Resetting/deallocating the buffer right after use (at strhandle) is
    possible with some more code, however, it doesn't always end up used,
    and to cover those cases too will require even more code, so resetting
    only on new string is good enough for now.

    Diffstat:
    Mst.c | 15+++++++++++----

    1 file changed, 11 insertions(+), 4 deletions(-)
    diff --git a/st.c b/st.c
    @@ -146,7 +146,8 @@ typedef struct {
     /* ESC type [[ [<priv>] <arg> [;]] <mode>] ESC '\' */
     typedef struct {
     	char type;             /* ESC type ... */
    -	char buf[STR_BUF_SIZ]; /* raw string */
    +	char *buf;             /* allocated raw string */
    +	size_t siz;            /* allocation size */
     	size_t len;            /* raw string length */
     	char *args[STR_ARG_SIZ];
     	int narg;              /* nb of args */
    @@ -1948,7 +1949,10 @@ strdump(void)
     void
     strreset(void)
     {
    -	memset(&strescseq, 0, sizeof(strescseq));
    +	strescseq = (STREscape){
    +		.buf = xrealloc(strescseq.buf, STR_BUF_SIZ),
    +		.siz = STR_BUF_SIZ,
    +	};
     }

     void
    @@ -2330,7 +2334,7 @@ tputc(Rune u)
     		if (term.esc&ESC_DCS && strescseq.len == 0 && u == 'q')
     			term.mode |= MODE_SIXEL;

    -		if (strescseq.len+len >= sizeof(strescseq.buf)) {
    +		if (strescseq.len+len >= strescseq.siz) {
     			/*
     			 * Here is a bug in terminals. If the user never sends
     			 * some code to stop the str or esc command, then st
    @@ -2344,7 +2348,10 @@ tputc(Rune u)
     			 * term.esc = 0;
     			 * strhandle();
     			 */
    -			return;
    +			if (strescseq.siz > (SIZE_MAX - UTF_SIZ) / 2)
    +				return;
    +			strescseq.siz *= 2;
    +			strescseq.buf = xrealloc(strescseq.buf, strescseq.siz);
     		}

     		memmove(&strescseq.buf[strescseq.len], c, len);