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libratbox: implement rb_linebuf_putprefix() which joins a format string to a static string

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This commit is contained in:
William Pitcock 2016-02-20 15:12:13 -06:00
parent 33085472a2
commit 5abeae60b8
2 changed files with 67 additions and 2 deletions
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1
libratbox/include/rb_linebuf.h
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@ -73,6 +73,7 @@ void rb_linebuf_donebuf(buf_head_t *);
int rb_linebuf_parse(buf_head_t *, char *, int, int);
int rb_linebuf_get(buf_head_t *, char *, int, int, int);
void rb_linebuf_putmsg(buf_head_t *, const char *, va_list *, const char *, ...);
void rb_linebuf_putprefix(buf_head_t *, const char *, va_list *, const char *);
void rb_linebuf_put(buf_head_t *, const char *, ...);
void rb_linebuf_putbuf(buf_head_t * bufhead, const char *buffer);
void rb_linebuf_attach(buf_head_t *, buf_head_t *);

68
libratbox/src/linebuf.c
View file

@ -494,8 +494,6 @@ rb_linebuf_attach(buf_head_t * bufhead, buf_head_t * new)
}
}
/*
* rb_linebuf_putmsg
*
@ -568,6 +566,72 @@ rb_linebuf_putmsg(buf_head_t * bufhead, const char *format, va_list * va_args,
bufhead->len += len;
}
/*
* rb_linebuf_putprefix
*
* Similar to rb_linebuf_put, but designed for use by send.c.
*
* prefix is inserted first, then format/va_args is appended to the buffer.
*/
void
rb_linebuf_putprefix(buf_head_t * bufhead, const char *format, va_list * va_args,
const char *prefix)
{
buf_line_t *bufline;
int len = 0;
/* make sure the previous line is terminated */
#ifndef NDEBUG
if(bufhead->list.tail)
{
bufline = bufhead->list.tail->data;
lrb_assert(bufline->terminated);
}
#endif
/* Create a new line */
bufline = rb_linebuf_new_line(bufhead);
if(prefix != NULL)
len = rb_strlcpy(bufline->buf, prefix, BUF_DATA_SIZE);
if(va_args != NULL)
{
len += vsnprintf((bufline->buf + len), (BUF_DATA_SIZE - len), format, *va_args);
}
bufline->terminated = 1;
/* Truncate the data if required */
if(rb_unlikely(len > 510))
{
len = 510;
bufline->buf[len++] = '\r';
bufline->buf[len++] = '\n';
}
else if(rb_unlikely(len == 0))
{
bufline->buf[len++] = '\r';
bufline->buf[len++] = '\n';
bufline->buf[len] = '\0';
}
else
{
/* Chop trailing CRLF's .. */
while((bufline->buf[len] == '\r') || (bufline->buf[len] == '\n')
|| (bufline->buf[len] == '\0'))
{
len--;
}
bufline->buf[++len] = '\r';
bufline->buf[++len] = '\n';
bufline->buf[++len] = '\0';
}
bufline->len = len;
bufhead->len += len;
}
void
rb_linebuf_putbuf(buf_head_t * bufhead, const char *buffer)
{