subr_sbuf.c revision 141616
169990Sdes/*- 269990Sdes * Copyright (c) 2000 Poul-Henning Kamp and Dag-Erling Co�dan Sm�rgrav 369990Sdes * All rights reserved. 469990Sdes * 569990Sdes * Redistribution and use in source and binary forms, with or without 669990Sdes * modification, are permitted provided that the following conditions 769990Sdes * are met: 869990Sdes * 1. Redistributions of source code must retain the above copyright 969990Sdes * notice, this list of conditions and the following disclaimer 1069990Sdes * in this position and unchanged. 1169990Sdes * 2. Redistributions in binary form must reproduce the above copyright 1269990Sdes * notice, this list of conditions and the following disclaimer in the 1369990Sdes * documentation and/or other materials provided with the distribution. 1469990Sdes * 3. The name of the author may not be used to endorse or promote products 1569990Sdes * derived from this software without specific prior written permission. 1669990Sdes * 1769990Sdes * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 1869990Sdes * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 1969990Sdes * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 2069990Sdes * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 2169990Sdes * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 2269990Sdes * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 2369990Sdes * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 2469990Sdes * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 2569990Sdes * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 2669990Sdes * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 2769990Sdes */ 2869990Sdes 29116182Sobrien#include <sys/cdefs.h> 30116182Sobrien__FBSDID("$FreeBSD: head/sys/kern/subr_sbuf.c 141616 2005-02-10 12:02:37Z phk $"); 31116182Sobrien 3269990Sdes#include <sys/param.h> 3374840Sken 3474840Sken#ifdef _KERNEL 3584097Sdes#include <sys/ctype.h> 3669990Sdes#include <sys/kernel.h> 3769990Sdes#include <sys/malloc.h> 3869990Sdes#include <sys/systm.h> 3984097Sdes#include <sys/uio.h> 4069990Sdes#include <machine/stdarg.h> 4174840Sken#else /* _KERNEL */ 4284097Sdes#include <ctype.h> 4374840Sken#include <stdarg.h> 4488950Skbyanc#include <stdio.h> 4578340Sjlemon#include <stdlib.h> 4688950Skbyanc#include <string.h> 4774840Sken#endif /* _KERNEL */ 4869990Sdes 4984097Sdes#include <sys/sbuf.h> 5084097Sdes 5174840Sken#ifdef _KERNEL 52141616Sphkstatic MALLOC_DEFINE(M_SBUF, "sbuf", "string buffers"); 53111119Simp#define SBMALLOC(size) malloc(size, M_SBUF, M_WAITOK) 5489121Skbyanc#define SBFREE(buf) free(buf, M_SBUF) 5574840Sken#else /* _KERNEL */ 5689121Skbyanc#define KASSERT(e, m) 5789121Skbyanc#define SBMALLOC(size) malloc(size) 5889121Skbyanc#define SBFREE(buf) free(buf) 5989121Skbyanc#define min(x,y) MIN(x,y) 6074840Sken#endif /* _KERNEL */ 6169990Sdes 6271721Sdes/* 6371721Sdes * Predicates 6471721Sdes */ 6589121Skbyanc#define SBUF_ISDYNAMIC(s) ((s)->s_flags & SBUF_DYNAMIC) 6689121Skbyanc#define SBUF_ISDYNSTRUCT(s) ((s)->s_flags & SBUF_DYNSTRUCT) 6789121Skbyanc#define SBUF_ISFINISHED(s) ((s)->s_flags & SBUF_FINISHED) 6889121Skbyanc#define SBUF_HASOVERFLOWED(s) ((s)->s_flags & SBUF_OVERFLOWED) 6989121Skbyanc#define SBUF_HASROOM(s) ((s)->s_len < (s)->s_size - 1) 7088950Skbyanc#define SBUF_FREESPACE(s) ((s)->s_size - (s)->s_len - 1) 7188950Skbyanc#define SBUF_CANEXTEND(s) ((s)->s_flags & SBUF_AUTOEXTEND) 7271721Sdes 7371721Sdes/* 7471721Sdes * Set / clear flags 7571721Sdes */ 7689121Skbyanc#define SBUF_SETFLAG(s, f) do { (s)->s_flags |= (f); } while (0) 7789121Skbyanc#define SBUF_CLEARFLAG(s, f) do { (s)->s_flags &= ~(f); } while (0) 7871721Sdes 7989121Skbyanc#define SBUF_MINEXTENDSIZE 16 /* Should be power of 2. */ 8089121Skbyanc#define SBUF_MAXEXTENDSIZE PAGE_SIZE 8189121Skbyanc#define SBUF_MAXEXTENDINCR PAGE_SIZE 8288950Skbyanc 8371721Sdes/* 8471721Sdes * Debugging support 8571721Sdes */ 8674840Sken#if defined(_KERNEL) && defined(INVARIANTS) 8769990Sdesstatic void 8892664Speter_assert_sbuf_integrity(const char *fun, struct sbuf *s) 8969990Sdes{ 9069990Sdes KASSERT(s != NULL, 9173891Sdes ("%s called with a NULL sbuf pointer", fun)); 9269990Sdes KASSERT(s->s_buf != NULL, 9388950Skbyanc ("%s called with uninitialized or corrupt sbuf", fun)); 9469990Sdes KASSERT(s->s_len < s->s_size, 9569990Sdes ("wrote past end of sbuf (%d >= %d)", s->s_len, s->s_size)); 9669990Sdes} 9769990Sdes 9869990Sdesstatic void 9992664Speter_assert_sbuf_state(const char *fun, struct sbuf *s, int state) 10069990Sdes{ 10169990Sdes KASSERT((s->s_flags & SBUF_FINISHED) == state, 10273891Sdes ("%s called with %sfinished or corrupt sbuf", fun, 10369990Sdes (state ? "un" : ""))); 10469990Sdes} 10589121Skbyanc#define assert_sbuf_integrity(s) _assert_sbuf_integrity(__func__, (s)) 10689121Skbyanc#define assert_sbuf_state(s, i) _assert_sbuf_state(__func__, (s), (i)) 10774840Sken#else /* _KERNEL && INVARIANTS */ 10889121Skbyanc#define assert_sbuf_integrity(s) do { } while (0) 10989121Skbyanc#define assert_sbuf_state(s, i) do { } while (0) 11074840Sken#endif /* _KERNEL && INVARIANTS */ 11169990Sdes 11288950Skbyancstatic int 11388950Skbyancsbuf_extendsize(int size) 11488950Skbyanc{ 11588950Skbyanc int newsize; 11688950Skbyanc 11788950Skbyanc newsize = SBUF_MINEXTENDSIZE; 11888950Skbyanc while (newsize < size) { 119103404Sphk if (newsize < (int)SBUF_MAXEXTENDSIZE) 12088950Skbyanc newsize *= 2; 12188950Skbyanc else 12288950Skbyanc newsize += SBUF_MAXEXTENDINCR; 12388950Skbyanc } 12488950Skbyanc 12588950Skbyanc return (newsize); 12688950Skbyanc} 12788950Skbyanc 12888950Skbyanc 12969990Sdes/* 13088950Skbyanc * Extend an sbuf. 13188950Skbyanc */ 13288950Skbyancstatic int 13388950Skbyancsbuf_extend(struct sbuf *s, int addlen) 13488950Skbyanc{ 13588950Skbyanc char *newbuf; 13688950Skbyanc int newsize; 13788950Skbyanc 13888950Skbyanc if (!SBUF_CANEXTEND(s)) 13988950Skbyanc return (-1); 14088950Skbyanc 14188950Skbyanc newsize = sbuf_extendsize(s->s_size + addlen); 14288950Skbyanc newbuf = (char *)SBMALLOC(newsize); 14388950Skbyanc if (newbuf == NULL) 14488950Skbyanc return (-1); 14588950Skbyanc bcopy(s->s_buf, newbuf, s->s_size); 14688950Skbyanc if (SBUF_ISDYNAMIC(s)) 14788950Skbyanc SBFREE(s->s_buf); 14888950Skbyanc else 14988950Skbyanc SBUF_SETFLAG(s, SBUF_DYNAMIC); 15088950Skbyanc s->s_buf = newbuf; 15188950Skbyanc s->s_size = newsize; 15288950Skbyanc return (0); 15388950Skbyanc} 15488950Skbyanc 15588950Skbyanc/* 15669990Sdes * Initialize an sbuf. 15769990Sdes * If buf is non-NULL, it points to a static or already-allocated string 15869990Sdes * big enough to hold at least length characters. 15969990Sdes */ 16077989Sdesstruct sbuf * 16171721Sdessbuf_new(struct sbuf *s, char *buf, int length, int flags) 16269990Sdes{ 16371721Sdes KASSERT(length >= 0, 16471721Sdes ("attempt to create an sbuf of negative length (%d)", length)); 16588950Skbyanc KASSERT((flags & ~SBUF_USRFLAGMSK) == 0, 16688950Skbyanc ("%s called with invalid flags", __func__)); 16769990Sdes 16888950Skbyanc flags &= SBUF_USRFLAGMSK; 16977989Sdes if (s == NULL) { 17077989Sdes s = (struct sbuf *)SBMALLOC(sizeof *s); 17177989Sdes if (s == NULL) 17277989Sdes return (NULL); 17377989Sdes bzero(s, sizeof *s); 17488950Skbyanc s->s_flags = flags; 17577989Sdes SBUF_SETFLAG(s, SBUF_DYNSTRUCT); 17677989Sdes } else { 17777989Sdes bzero(s, sizeof *s); 17888950Skbyanc s->s_flags = flags; 17977989Sdes } 18069990Sdes s->s_size = length; 18169990Sdes if (buf) { 18269990Sdes s->s_buf = buf; 18377989Sdes return (s); 18469990Sdes } 18588950Skbyanc if (flags & SBUF_AUTOEXTEND) 18688950Skbyanc s->s_size = sbuf_extendsize(s->s_size); 18774840Sken s->s_buf = (char *)SBMALLOC(s->s_size); 18877989Sdes if (s->s_buf == NULL) { 18977989Sdes if (SBUF_ISDYNSTRUCT(s)) 19077989Sdes SBFREE(s); 19177989Sdes return (NULL); 19277989Sdes } 19369990Sdes SBUF_SETFLAG(s, SBUF_DYNAMIC); 19477989Sdes return (s); 19569990Sdes} 19669990Sdes 19784097Sdes#ifdef _KERNEL 19869990Sdes/* 19984097Sdes * Create an sbuf with uio data 20084097Sdes */ 20184097Sdesstruct sbuf * 20284097Sdessbuf_uionew(struct sbuf *s, struct uio *uio, int *error) 20384097Sdes{ 20484097Sdes KASSERT(uio != NULL, 20587594Sobrien ("%s called with NULL uio pointer", __func__)); 20684097Sdes KASSERT(error != NULL, 20787594Sobrien ("%s called with NULL error pointer", __func__)); 20884097Sdes 20984097Sdes s = sbuf_new(s, NULL, uio->uio_resid + 1, 0); 21084097Sdes if (s == NULL) { 21184097Sdes *error = ENOMEM; 21284097Sdes return (NULL); 21384097Sdes } 21484097Sdes *error = uiomove(s->s_buf, uio->uio_resid, uio); 21584097Sdes if (*error != 0) { 21684097Sdes sbuf_delete(s); 21784097Sdes return (NULL); 21884097Sdes } 21984097Sdes s->s_len = s->s_size - 1; 22084097Sdes *error = 0; 22184097Sdes return (s); 22284097Sdes} 22384097Sdes#endif 22484097Sdes 22584097Sdes/* 22688950Skbyanc * Clear an sbuf and reset its position. 22771721Sdes */ 22871721Sdesvoid 22971721Sdessbuf_clear(struct sbuf *s) 23071721Sdes{ 23171721Sdes assert_sbuf_integrity(s); 23271724Sdes /* don't care if it's finished or not */ 23371721Sdes 23471721Sdes SBUF_CLEARFLAG(s, SBUF_FINISHED); 23571721Sdes SBUF_CLEARFLAG(s, SBUF_OVERFLOWED); 23671721Sdes s->s_len = 0; 23771721Sdes} 23871721Sdes 23971721Sdes/* 24088950Skbyanc * Set the sbuf's end position to an arbitrary value. 24188950Skbyanc * Effectively truncates the sbuf at the new position. 24269990Sdes */ 24369990Sdesint 24471721Sdessbuf_setpos(struct sbuf *s, int pos) 24569990Sdes{ 24669990Sdes assert_sbuf_integrity(s); 24769990Sdes assert_sbuf_state(s, 0); 248125937Sdes 24969990Sdes KASSERT(pos >= 0, 25069990Sdes ("attempt to seek to a negative position (%d)", pos)); 25169990Sdes KASSERT(pos < s->s_size, 25269990Sdes ("attempt to seek past end of sbuf (%d >= %d)", pos, s->s_size)); 253125937Sdes 25469990Sdes if (pos < 0 || pos > s->s_len) 25569990Sdes return (-1); 25669990Sdes s->s_len = pos; 25769990Sdes return (0); 25869990Sdes} 25969990Sdes 26069990Sdes/* 26178077Sdes * Append a byte string to an sbuf. 26278077Sdes */ 26378077Sdesint 264131869Sdessbuf_bcat(struct sbuf *s, const void *buf, size_t len) 26578077Sdes{ 266131869Sdes const char *str = buf; 267131868Sdes 26878077Sdes assert_sbuf_integrity(s); 26978077Sdes assert_sbuf_state(s, 0); 270125937Sdes 27178077Sdes if (SBUF_HASOVERFLOWED(s)) 27278077Sdes return (-1); 273125937Sdes 27489765Sphk for (; len; len--) { 27588950Skbyanc if (!SBUF_HASROOM(s) && sbuf_extend(s, len) < 0) 27688950Skbyanc break; 27778077Sdes s->s_buf[s->s_len++] = *str++; 27888950Skbyanc } 27978077Sdes if (len) { 28078077Sdes SBUF_SETFLAG(s, SBUF_OVERFLOWED); 28178077Sdes return (-1); 28278077Sdes } 28378077Sdes return (0); 28478077Sdes} 28578077Sdes 28678077Sdes#ifdef _KERNEL 28778077Sdes/* 28878077Sdes * Copy a byte string from userland into an sbuf. 28978077Sdes */ 29078077Sdesint 29178077Sdessbuf_bcopyin(struct sbuf *s, const void *uaddr, size_t len) 29278077Sdes{ 29378077Sdes assert_sbuf_integrity(s); 29478077Sdes assert_sbuf_state(s, 0); 29578077Sdes 29678077Sdes if (SBUF_HASOVERFLOWED(s)) 29778077Sdes return (-1); 29878077Sdes 29978077Sdes if (len == 0) 30078077Sdes return (0); 30188950Skbyanc if (len > SBUF_FREESPACE(s)) { 30288950Skbyanc sbuf_extend(s, len - SBUF_FREESPACE(s)); 30388950Skbyanc len = min(len, SBUF_FREESPACE(s)); 30488950Skbyanc } 30578092Sdes if (copyin(uaddr, s->s_buf + s->s_len, len) != 0) 30678092Sdes return (-1); 30778095Sdes s->s_len += len; 308125937Sdes 30978077Sdes return (0); 31078077Sdes} 31178077Sdes#endif 31278077Sdes 31378077Sdes/* 31478077Sdes * Copy a byte string into an sbuf. 31578077Sdes */ 31678077Sdesint 317131869Sdessbuf_bcpy(struct sbuf *s, const void *buf, size_t len) 31878077Sdes{ 31978077Sdes assert_sbuf_integrity(s); 32078077Sdes assert_sbuf_state(s, 0); 321125937Sdes 32278077Sdes sbuf_clear(s); 323131869Sdes return (sbuf_bcat(s, buf, len)); 32478077Sdes} 32578077Sdes 32678077Sdes/* 32769990Sdes * Append a string to an sbuf. 32869990Sdes */ 32969990Sdesint 33074840Skensbuf_cat(struct sbuf *s, const char *str) 33169990Sdes{ 33269990Sdes assert_sbuf_integrity(s); 33369990Sdes assert_sbuf_state(s, 0); 334125937Sdes 33569990Sdes if (SBUF_HASOVERFLOWED(s)) 33669990Sdes return (-1); 337125937Sdes 33888950Skbyanc while (*str) { 33988950Skbyanc if (!SBUF_HASROOM(s) && sbuf_extend(s, strlen(str)) < 0) 34088950Skbyanc break; 34169990Sdes s->s_buf[s->s_len++] = *str++; 34288950Skbyanc } 34369990Sdes if (*str) { 34469990Sdes SBUF_SETFLAG(s, SBUF_OVERFLOWED); 34569990Sdes return (-1); 34669990Sdes } 34769990Sdes return (0); 34869990Sdes} 34969990Sdes 35078077Sdes#ifdef _KERNEL 35169990Sdes/* 35288950Skbyanc * Append a string from userland to an sbuf. 35378077Sdes */ 35478077Sdesint 35578077Sdessbuf_copyin(struct sbuf *s, const void *uaddr, size_t len) 35678077Sdes{ 35778077Sdes size_t done; 358125937Sdes 35978077Sdes assert_sbuf_integrity(s); 36078077Sdes assert_sbuf_state(s, 0); 36178077Sdes 36278077Sdes if (SBUF_HASOVERFLOWED(s)) 36378077Sdes return (-1); 36478077Sdes 36588950Skbyanc if (len == 0) 36688950Skbyanc len = SBUF_FREESPACE(s); /* XXX return 0? */ 36788950Skbyanc if (len > SBUF_FREESPACE(s)) { 36888950Skbyanc sbuf_extend(s, len); 36988950Skbyanc len = min(len, SBUF_FREESPACE(s)); 37088950Skbyanc } 37178077Sdes switch (copyinstr(uaddr, s->s_buf + s->s_len, len + 1, &done)) { 37278077Sdes case ENAMETOOLONG: 37378077Sdes SBUF_SETFLAG(s, SBUF_OVERFLOWED); 37478077Sdes /* fall through */ 37578077Sdes case 0: 37678077Sdes s->s_len += done - 1; 37778077Sdes break; 37878077Sdes default: 37978077Sdes return (-1); /* XXX */ 38078077Sdes } 381125937Sdes 38278077Sdes return (0); 38378077Sdes} 38478077Sdes#endif 38578077Sdes 38678077Sdes/* 38769990Sdes * Copy a string into an sbuf. 38869990Sdes */ 38969990Sdesint 39074840Skensbuf_cpy(struct sbuf *s, const char *str) 39169990Sdes{ 39269990Sdes assert_sbuf_integrity(s); 39369990Sdes assert_sbuf_state(s, 0); 394125937Sdes 39571721Sdes sbuf_clear(s); 39669990Sdes return (sbuf_cat(s, str)); 39769990Sdes} 39869990Sdes 39969990Sdes/* 40088950Skbyanc * Format the given argument list and append the resulting string to an sbuf. 40169990Sdes */ 40269990Sdesint 40388950Skbyancsbuf_vprintf(struct sbuf *s, const char *fmt, va_list ap) 40469990Sdes{ 405115311Speter va_list ap_copy; 40671721Sdes int len; 40769990Sdes 40869990Sdes assert_sbuf_integrity(s); 40969990Sdes assert_sbuf_state(s, 0); 41088950Skbyanc 41169990Sdes KASSERT(fmt != NULL, 41287594Sobrien ("%s called with a NULL format string", __func__)); 41388950Skbyanc 41469990Sdes if (SBUF_HASOVERFLOWED(s)) 41569990Sdes return (-1); 41669990Sdes 41788950Skbyanc do { 418115311Speter va_copy(ap_copy, ap); 41988950Skbyanc len = vsnprintf(&s->s_buf[s->s_len], SBUF_FREESPACE(s) + 1, 420115311Speter fmt, ap_copy); 421115311Speter va_end(ap_copy); 42288950Skbyanc } while (len > SBUF_FREESPACE(s) && 42388950Skbyanc sbuf_extend(s, len - SBUF_FREESPACE(s)) == 0); 42469990Sdes 42574840Sken /* 42674840Sken * s->s_len is the length of the string, without the terminating nul. 42774840Sken * When updating s->s_len, we must subtract 1 from the length that 42874840Sken * we passed into vsnprintf() because that length includes the 42974840Sken * terminating nul. 43074840Sken * 43174840Sken * vsnprintf() returns the amount that would have been copied, 43274840Sken * given sufficient space, hence the min() calculation below. 43374840Sken */ 43488950Skbyanc s->s_len += min(len, SBUF_FREESPACE(s)); 43589646Sphk if (!SBUF_HASROOM(s) && !SBUF_CANEXTEND(s)) 43674840Sken SBUF_SETFLAG(s, SBUF_OVERFLOWED); 43774840Sken 43869990Sdes KASSERT(s->s_len < s->s_size, 43969990Sdes ("wrote past end of sbuf (%d >= %d)", s->s_len, s->s_size)); 44069990Sdes 44169990Sdes if (SBUF_HASOVERFLOWED(s)) 44269990Sdes return (-1); 44369990Sdes return (0); 44469990Sdes} 44569990Sdes 44669990Sdes/* 44788950Skbyanc * Format the given arguments and append the resulting string to an sbuf. 44888950Skbyanc */ 44988950Skbyancint 45088950Skbyancsbuf_printf(struct sbuf *s, const char *fmt, ...) 45188950Skbyanc{ 45288950Skbyanc va_list ap; 45388950Skbyanc int result; 45488950Skbyanc 45588950Skbyanc va_start(ap, fmt); 45688950Skbyanc result = sbuf_vprintf(s, fmt, ap); 45788950Skbyanc va_end(ap); 45888950Skbyanc return(result); 45988950Skbyanc} 46088950Skbyanc 46188950Skbyanc/* 46269990Sdes * Append a character to an sbuf. 46369990Sdes */ 46469990Sdesint 46569990Sdessbuf_putc(struct sbuf *s, int c) 46669990Sdes{ 46769990Sdes assert_sbuf_integrity(s); 46869990Sdes assert_sbuf_state(s, 0); 469125937Sdes 47069990Sdes if (SBUF_HASOVERFLOWED(s)) 47169990Sdes return (-1); 472125937Sdes 47388950Skbyanc if (!SBUF_HASROOM(s) && sbuf_extend(s, 1) < 0) { 47469990Sdes SBUF_SETFLAG(s, SBUF_OVERFLOWED); 47569990Sdes return (-1); 47669990Sdes } 47773891Sdes if (c != '\0') 47873891Sdes s->s_buf[s->s_len++] = c; 47969990Sdes return (0); 48069990Sdes} 48169990Sdes 48269990Sdes/* 48388950Skbyanc * Trim whitespace characters from end of an sbuf. 48484097Sdes */ 48584097Sdesint 48684097Sdessbuf_trim(struct sbuf *s) 48784097Sdes{ 48884097Sdes assert_sbuf_integrity(s); 48984097Sdes assert_sbuf_state(s, 0); 490125937Sdes 49184097Sdes if (SBUF_HASOVERFLOWED(s)) 49284097Sdes return (-1); 493125937Sdes 49484097Sdes while (s->s_len && isspace(s->s_buf[s->s_len-1])) 49584097Sdes --s->s_len; 49684097Sdes 49784097Sdes return (0); 49884097Sdes} 49984097Sdes 50084097Sdes/* 50171721Sdes * Check if an sbuf overflowed 50271721Sdes */ 50371721Sdesint 50471721Sdessbuf_overflowed(struct sbuf *s) 50571721Sdes{ 50671721Sdes return SBUF_HASOVERFLOWED(s); 50771721Sdes} 50871721Sdes 50971721Sdes/* 51069990Sdes * Finish off an sbuf. 51169990Sdes */ 51271721Sdesvoid 51369990Sdessbuf_finish(struct sbuf *s) 51469990Sdes{ 51569990Sdes assert_sbuf_integrity(s); 51669990Sdes assert_sbuf_state(s, 0); 517125937Sdes 51873891Sdes s->s_buf[s->s_len] = '\0'; 51971721Sdes SBUF_CLEARFLAG(s, SBUF_OVERFLOWED); 52069990Sdes SBUF_SETFLAG(s, SBUF_FINISHED); 52169990Sdes} 52269990Sdes 52369990Sdes/* 52469990Sdes * Return a pointer to the sbuf data. 52569990Sdes */ 52669990Sdeschar * 52769990Sdessbuf_data(struct sbuf *s) 52869990Sdes{ 52969990Sdes assert_sbuf_integrity(s); 53069990Sdes assert_sbuf_state(s, SBUF_FINISHED); 531125937Sdes 53269990Sdes return s->s_buf; 53369990Sdes} 53469990Sdes 53569990Sdes/* 53669990Sdes * Return the length of the sbuf data. 53769990Sdes */ 53871721Sdesint 53969990Sdessbuf_len(struct sbuf *s) 54069990Sdes{ 54169990Sdes assert_sbuf_integrity(s); 54271724Sdes /* don't care if it's finished or not */ 543125937Sdes 54469990Sdes if (SBUF_HASOVERFLOWED(s)) 54571721Sdes return (-1); 54669990Sdes return s->s_len; 54769990Sdes} 54869990Sdes 54969990Sdes/* 55069990Sdes * Clear an sbuf, free its buffer if necessary. 55169990Sdes */ 55269990Sdesvoid 55369990Sdessbuf_delete(struct sbuf *s) 55469990Sdes{ 55588219Sdillon int isdyn; 55688219Sdillon 55769990Sdes assert_sbuf_integrity(s); 55869990Sdes /* don't care if it's finished or not */ 559125937Sdes 56069990Sdes if (SBUF_ISDYNAMIC(s)) 56174840Sken SBFREE(s->s_buf); 56288219Sdillon isdyn = SBUF_ISDYNSTRUCT(s); 56369990Sdes bzero(s, sizeof *s); 56488219Sdillon if (isdyn) 56577989Sdes SBFREE(s); 56669990Sdes} 567104449Sphk 568104449Sphk/* 569104449Sphk * Check if an sbuf has been finished. 570104449Sphk */ 571104449Sphkint 572104449Sphksbuf_done(struct sbuf *s) 573104449Sphk{ 574104449Sphk 575104449Sphk return(SBUF_ISFINISHED(s)); 576104449Sphk} 577