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Implement Short/Small String Optimization in SBUF(9) and change lengths and
positions in the API from ssize_t and int to size_t. CR: D388 Approved by: des, bapt
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parent
4472d6e1df
commit
7150b86bfe
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=268494
@ -4,7 +4,7 @@ LIB= sbuf
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SHLIBDIR?= /lib
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SRCS= subr_sbuf.c
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SHLIB_MAJOR = 6
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SHLIB_MAJOR = 7
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SYMBOL_MAPS= ${.CURDIR}/Symbol.map
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VERSION_DEF= ${.CURDIR}/Version.def
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@ -152,11 +152,16 @@ static int
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sbuf_extend(struct sbuf *s, int addlen)
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{
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char *newbuf;
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int newsize;
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size_t newsize;
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if (!SBUF_CANEXTEND(s))
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return (-1);
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newsize = sbuf_extendsize(s->s_size + addlen);
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if (s->s_buf == s->s_static_buf && newsize <= sizeof(s->s_static_buf)) {
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s->s_size = sizeof(s->s_static_buf);
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return (0);
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}
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newbuf = SBMALLOC(newsize);
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if (newbuf == NULL)
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return (-1);
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@ -176,7 +181,7 @@ sbuf_extend(struct sbuf *s, int addlen)
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* big enough to hold at least length characters.
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*/
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static struct sbuf *
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sbuf_newbuf(struct sbuf *s, char *buf, int length, int flags)
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sbuf_newbuf(struct sbuf *s, char *buf, size_t length, int flags)
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{
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memset(s, 0, sizeof(*s));
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@ -195,6 +200,11 @@ sbuf_newbuf(struct sbuf *s, char *buf, int length, int flags)
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if ((flags & SBUF_AUTOEXTEND) != 0)
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s->s_size = sbuf_extendsize(s->s_size);
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if (s->s_size <= sizeof(s->s_static_buf)) {
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s->s_buf = s->s_static_buf;
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return (s);
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}
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s->s_buf = SBMALLOC(s->s_size);
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if (s->s_buf == NULL)
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return (NULL);
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@ -283,21 +293,19 @@ sbuf_clear(struct sbuf *s)
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* Effectively truncates the sbuf at the new position.
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*/
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int
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sbuf_setpos(struct sbuf *s, ssize_t pos)
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sbuf_setpos(struct sbuf *s, size_t pos)
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{
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assert_sbuf_integrity(s);
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assert_sbuf_state(s, 0);
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KASSERT(pos >= 0,
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("attempt to seek to a negative position (%jd)", (intmax_t)pos));
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KASSERT(pos < s->s_size,
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("attempt to seek past end of sbuf (%jd >= %jd)",
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(intmax_t)pos, (intmax_t)s->s_size));
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KASSERT(!SBUF_ISSECTION(s),
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("attempt to seek when in a section"));
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if (pos < 0 || pos > s->s_len)
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if (pos > s->s_len)
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return (-1);
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s->s_len = pos;
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return (0);
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@ -561,7 +569,8 @@ int
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sbuf_vprintf(struct sbuf *s, const char *fmt, va_list ap)
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{
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va_list ap_copy;
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int error, len;
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size_t len;
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int error;
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assert_sbuf_integrity(s);
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assert_sbuf_state(s, 0);
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@ -44,8 +44,8 @@ struct sbuf {
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sbuf_drain_func *s_drain_func; /* drain function */
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void *s_drain_arg; /* user-supplied drain argument */
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int s_error; /* current error code */
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ssize_t s_size; /* size of storage buffer */
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ssize_t s_len; /* current length of string */
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size_t s_size; /* size of storage buffer */
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size_t s_len; /* current length of string */
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#define SBUF_FIXEDLEN 0x00000000 /* fixed length buffer (default) */
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#define SBUF_AUTOEXTEND 0x00000001 /* automatically extend buffer */
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#define SBUF_USRFLAGMSK 0x0000ffff /* mask of flags the user may specify */
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@ -55,6 +55,9 @@ struct sbuf {
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#define SBUF_INSECTION 0x00100000 /* set by sbuf_start_section() */
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int s_flags; /* flags */
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ssize_t s_sect_len; /* current length of section */
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#define SBUF_STATIC_LEN 64 /* static storage buffer length */
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char s_static_buf[SBUF_STATIC_LEN];
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/* static storage buffer */
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};
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__BEGIN_DECLS
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@ -65,7 +68,7 @@ struct sbuf *sbuf_new(struct sbuf *, char *, int, int);
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#define sbuf_new_auto() \
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sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND)
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void sbuf_clear(struct sbuf *);
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int sbuf_setpos(struct sbuf *, ssize_t);
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int sbuf_setpos(struct sbuf *, size_t);
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int sbuf_bcat(struct sbuf *, const void *, size_t);
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int sbuf_bcpy(struct sbuf *, const void *, size_t);
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int sbuf_cat(struct sbuf *, const char *);
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