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MINOR: channel: new getword and getchar functions on channel.

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This patch adds two new functions to get a char
or a word from a channel.
This commit is contained in:
Emeric Brun 2020-10-05 14:35:21 +02:00 committed by Willy Tarreau
parent 2897644ae5
commit 6d75616951
2 changed files with 76 additions and 0 deletions
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2
include/haproxy/channel.h
View File

@ -47,7 +47,9 @@ int ci_getline_nc(const struct channel *chn, char **blk1, size_t *len1, char **b
int ci_getblk_nc(const struct channel *chn, char **blk1, size_t *len1, char **blk2, size_t *len2);
int ci_insert_line2(struct channel *c, int pos, const char *str, int len);
int co_inject(struct channel *chn, const char *msg, int len);
int co_getchar(const struct channel *chn, char *c);
int co_getline(const struct channel *chn, char *str, int len);
int co_getword(const struct channel *chn, char *str, int len, char sep);
int co_getblk(const struct channel *chn, char *blk, int len, int offset);
int co_getline_nc(const struct channel *chn, const char **blk1, size_t *len1, const char **blk2, size_t *len2);
int co_getblk_nc(const struct channel *chn, const char **blk1, size_t *len1, const char **blk2, size_t *len2);

74
src/channel.c
View File

@ -175,6 +175,57 @@ int ci_putblk(struct channel *chn, const char *blk, int len)
return len;
}
/* Gets one text word out of a channel's buffer from a stream interface.
* Return values :
* >0 : number of bytes read. Includes the sep if present before len or end.
* =0 : no sep before end found. <str> is left undefined.
* <0 : no more bytes readable because output is shut.
* The channel status is not changed. The caller must call co_skip() to
* update it. The line separator is waited for as long as neither the buffer
* nor the output are full. If either of them is full, the string may be
* returned as is, without the line separator.
*/
int co_getword(const struct channel *chn, char *str, int len, char sep)
{
int ret, max;
char *p;
ret = 0;
max = len;
/* closed or empty + imminent close = -1; empty = 0 */
if (unlikely((chn->flags & CF_SHUTW) || channel_is_empty(chn))) {
if (chn->flags & (CF_SHUTW|CF_SHUTW_NOW))
ret = -1;
goto out;
}
p = co_head(chn);
if (max > co_data(chn)) {
max = co_data(chn);
str[max-1] = 0;
}
while (max) {
*str++ = *p;
ret++;
max--;
if (*p == sep)
break;
p = b_next(&chn->buf, p);
}
if (ret > 0 && ret < len &&
(ret < co_data(chn) || channel_may_recv(chn)) &&
*(str-1) != sep &&
!(chn->flags & (CF_SHUTW|CF_SHUTW_NOW)))
ret = 0;
out:
if (max)
*str = 0;
return ret;
}
/* Gets one text line out of a channel's buffer from a stream interface.
* Return values :
* >0 : number of bytes read. Includes the \n if present before len or end.
@ -226,6 +277,29 @@ int co_getline(const struct channel *chn, char *str, int len)
return ret;
}
/* Gets one char of data from a channel's buffer,
* Return values :
* 1 : number of bytes read, equal to requested size.
* =0 : not enough data available. <c> is left undefined.
* <0 : no more bytes readable because output is shut.
* The channel status is not changed. The caller must call co_skip() to
* update it.
*/
int co_getchar(const struct channel *chn, char *c)
{
if (chn->flags & CF_SHUTW)
return -1;
if (unlikely(co_data(chn) == 0)) {
if (chn->flags & (CF_SHUTW|CF_SHUTW_NOW))
return -1;
return 0;
}
*c = *(co_head(chn));
return 1;
}
/* Gets one full block of data at once from a channel's buffer, optionally from
* a specific offset. Return values :
* >0 : number of bytes read, equal to requested size.