Add strbuf API
Shamelessly stolen from Git.
This commit is contained in:
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435
src/strbuf.c
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435
src/strbuf.c
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/*
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Copyright (c) 2005-2008 Junio C. Hamano et al.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License (version 2)
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as published by the Free Software Foundation.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <ctype.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include "strbuf.h"
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#include "util.h"
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#define die fatal
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#define alloc_nr(x) (((x)+16)*3/2)
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/*
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* * Realloc the buffer pointed at by variable 'x' so that it can hold
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* * at least 'nr' entries; the number of entries currently allocated
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* * is 'alloc', using the standard growing factor alloc_nr() macro.
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* *
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* * DO NOT USE any expression with side-effect for 'x' or 'alloc'.
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* */
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#define ALLOC_GROW(x, nr, alloc) \
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do { \
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if ((nr) > alloc) { \
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if (alloc_nr(alloc) < (nr)) \
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alloc = (nr); \
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else \
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alloc = alloc_nr(alloc); \
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x = xrealloc((x), alloc * sizeof(*(x))); \
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} \
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} while(0)
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static inline char *gitstrchrnul(const char *s, int c)
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{
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while (*s && *s != c)
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s++;
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return (char *)s;
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}
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int prefixcmp(const char *str, const char *prefix)
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{
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for (; ; str++, prefix++)
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if (!*prefix)
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return 0;
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else if (*str != *prefix)
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return (unsigned char)*prefix - (unsigned char)*str;
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}
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/*
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* Used as the default ->buf value, so that people can always assume
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* buf is non NULL and ->buf is NUL terminated even for a freshly
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* initialized strbuf.
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*/
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char strbuf_slopbuf[1];
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void strbuf_init(struct strbuf *sb, size_t hint)
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{
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sb->alloc = sb->len = 0;
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sb->buf = strbuf_slopbuf;
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if (hint)
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strbuf_grow(sb, hint);
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}
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void strbuf_release(struct strbuf *sb)
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{
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if (sb->alloc) {
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free(sb->buf);
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strbuf_init(sb, 0);
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}
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}
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char *strbuf_detach(struct strbuf *sb, size_t *sz)
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{
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char *res = sb->alloc ? sb->buf : NULL;
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if (sz)
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*sz = sb->len;
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strbuf_init(sb, 0);
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return res;
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}
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void strbuf_attach(struct strbuf *sb, void *buf, size_t len, size_t alloc)
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{
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strbuf_release(sb);
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sb->buf = buf;
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sb->len = len;
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sb->alloc = alloc;
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strbuf_grow(sb, 0);
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sb->buf[sb->len] = '\0';
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}
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void strbuf_grow(struct strbuf *sb, size_t extra)
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{
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if (sb->len + extra + 1 <= sb->len)
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die("you want to use way too much memory");
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if (!sb->alloc)
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sb->buf = NULL;
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ALLOC_GROW(sb->buf, sb->len + extra + 1, sb->alloc);
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}
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void strbuf_trim(struct strbuf *sb)
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{
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char *b = sb->buf;
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while (sb->len > 0 && isspace((unsigned char)sb->buf[sb->len - 1]))
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sb->len--;
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while (sb->len > 0 && isspace(*b)) {
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b++;
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sb->len--;
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}
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memmove(sb->buf, b, sb->len);
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sb->buf[sb->len] = '\0';
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}
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void strbuf_rtrim(struct strbuf *sb)
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{
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while (sb->len > 0 && isspace((unsigned char)sb->buf[sb->len - 1]))
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sb->len--;
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sb->buf[sb->len] = '\0';
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}
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void strbuf_ltrim(struct strbuf *sb)
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{
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char *b = sb->buf;
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while (sb->len > 0 && isspace(*b)) {
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b++;
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sb->len--;
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}
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memmove(sb->buf, b, sb->len);
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sb->buf[sb->len] = '\0';
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}
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void strbuf_tolower(struct strbuf *sb)
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{
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int i;
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for (i = 0; i < sb->len; i++)
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sb->buf[i] = tolower(sb->buf[i]);
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}
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struct strbuf **strbuf_split(const struct strbuf *sb, int delim)
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{
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int alloc = 2, pos = 0;
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char *n, *p;
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struct strbuf **ret;
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struct strbuf *t;
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ret = xcalloc(alloc, sizeof(struct strbuf *));
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p = n = sb->buf;
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while (n < sb->buf + sb->len) {
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int len;
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n = memchr(n, delim, sb->len - (n - sb->buf));
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if (pos + 1 >= alloc) {
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alloc = alloc * 2;
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ret = xrealloc(ret, sizeof(struct strbuf *) * alloc);
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}
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if (!n)
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n = sb->buf + sb->len - 1;
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len = n - p + 1;
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t = xmalloc(sizeof(struct strbuf));
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strbuf_init(t, len);
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strbuf_add(t, p, len);
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ret[pos] = t;
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ret[++pos] = NULL;
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p = ++n;
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}
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return ret;
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}
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struct strbuf **strbuf_splitws(const struct strbuf *sb)
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{
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int alloc = 2, pos = 0;
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struct strbuf **ret;
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int prev_ws = 1, ws;
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int i, start = 0;
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ret = xcalloc(alloc, sizeof(struct strbuf *));
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for (i = 0; i <= sb->len; i++) {
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ws = !sb->buf[i] || isspace(sb->buf[i]);
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if (prev_ws == ws)
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continue;
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if (!ws) {
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start = i;
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} else {
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if (pos + 1 >= alloc) {
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alloc = alloc * 2;
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ret = xrealloc(ret, sizeof(struct strbuf *) * alloc);
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}
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ret[pos] = xmalloc(sizeof(struct strbuf));
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strbuf_init(ret[pos], i - start);
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strbuf_add(ret[pos], &sb->buf[start], i - start);
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pos++;
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}
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prev_ws = ws;
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}
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ret[pos] = NULL;
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return ret;
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}
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void strbuf_list_free(struct strbuf **sbs)
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{
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struct strbuf **s = sbs;
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while (*s) {
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strbuf_release(*s);
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free(*s++);
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}
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free(sbs);
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}
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size_t strbuf_list_len(struct strbuf **sbs)
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{
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size_t n = 0;
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while (*sbs++)
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n++;
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return n;
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}
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int strbuf_cmp(const struct strbuf *a, const struct strbuf *b)
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{
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int cmp;
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if (a->len < b->len) {
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cmp = memcmp(a->buf, b->buf, a->len);
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return cmp ? cmp : -1;
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} else {
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cmp = memcmp(a->buf, b->buf, b->len);
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return cmp ? cmp : a->len != b->len;
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}
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}
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void strbuf_splice(struct strbuf *sb, size_t pos, size_t len,
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const void *data, size_t dlen)
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{
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if (pos + len < pos)
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die("you want to use way too much memory");
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if (pos > sb->len)
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die("`pos' is too far after the end of the buffer");
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if (pos + len > sb->len)
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die("`pos + len' is too far after the end of the buffer");
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if (dlen >= len)
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strbuf_grow(sb, dlen - len);
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memmove(sb->buf + pos + dlen,
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sb->buf + pos + len,
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sb->len - pos - len);
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memcpy(sb->buf + pos, data, dlen);
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strbuf_setlen(sb, sb->len + dlen - len);
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}
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void strbuf_insert(struct strbuf *sb, size_t pos, const void *data, size_t len)
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{
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strbuf_splice(sb, pos, 0, data, len);
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}
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void strbuf_remove(struct strbuf *sb, size_t pos, size_t len)
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{
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strbuf_splice(sb, pos, len, NULL, 0);
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}
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void strbuf_add(struct strbuf *sb, const void *data, size_t len)
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{
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strbuf_grow(sb, len);
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memcpy(sb->buf + sb->len, data, len);
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strbuf_setlen(sb, sb->len + len);
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}
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void strbuf_adddup(struct strbuf *sb, size_t pos, size_t len)
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{
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strbuf_grow(sb, len);
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memcpy(sb->buf + sb->len, sb->buf + pos, len);
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strbuf_setlen(sb, sb->len + len);
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}
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void strbuf_addf(struct strbuf *sb, const char *fmt, ...)
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{
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int len;
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va_list ap;
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if (!strbuf_avail(sb))
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strbuf_grow(sb, 64);
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va_start(ap, fmt);
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len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
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va_end(ap);
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if (len < 0)
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die("your vsnprintf is broken");
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if (len > strbuf_avail(sb)) {
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strbuf_grow(sb, len);
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va_start(ap, fmt);
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len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
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va_end(ap);
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if (len > strbuf_avail(sb)) {
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die("this should not happen, your snprintf is broken");
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}
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}
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strbuf_setlen(sb, sb->len + len);
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}
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void strbuf_expand(struct strbuf *sb, const char *format, expand_fn_t fn,
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void *context)
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{
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for (;;) {
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const char *percent;
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size_t consumed;
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percent = gitstrchrnul(format, '%');
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strbuf_add(sb, format, percent - format);
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if (!*percent)
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break;
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format = percent + 1;
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consumed = fn(sb, format, context);
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if (consumed)
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format += consumed;
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else
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strbuf_addch(sb, '%');
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}
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}
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size_t strbuf_expand_dict_cb(struct strbuf *sb, const char *placeholder,
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void *context)
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{
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struct strbuf_expand_dict_entry *e = context;
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size_t len;
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for (; e->placeholder && (len = strlen(e->placeholder)); e++) {
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if (!strncmp(placeholder, e->placeholder, len)) {
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if (e->value)
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strbuf_addstr(sb, e->value);
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return len;
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}
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}
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return 0;
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}
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size_t strbuf_fread(struct strbuf *sb, size_t size, FILE *f)
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{
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size_t res;
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strbuf_grow(sb, size);
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res = fread(sb->buf + sb->len, 1, size, f);
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if (res > 0) {
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strbuf_setlen(sb, sb->len + res);
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}
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return res;
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}
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ssize_t strbuf_write(struct strbuf *sb, int fd) {
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ssize_t total = 0;
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while (total < sb->len) {
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ssize_t cnt = write(fd, sb->buf + total, sb->len - total);
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if (cnt <= 0)
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return -1;
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total += cnt;
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}
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return total;
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}
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ssize_t strbuf_read(struct strbuf *sb, int fd, size_t hint)
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{
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size_t oldlen = sb->len;
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strbuf_grow(sb, hint ? hint : 8192);
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for (;;) {
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ssize_t cnt;
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cnt = read(fd, sb->buf + sb->len, sb->alloc - sb->len - 1);
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if (cnt < 0) {
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strbuf_setlen(sb, oldlen);
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return -1;
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}
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if (!cnt)
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break;
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sb->len += cnt;
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strbuf_grow(sb, 8192);
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}
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sb->buf[sb->len] = '\0';
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return sb->len - oldlen;
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}
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int strbuf_getline(struct strbuf *sb, FILE *fp, int term)
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{
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int ch;
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strbuf_grow(sb, 0);
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if (feof(fp))
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return EOF;
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strbuf_reset(sb);
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while ((ch = fgetc(fp)) != EOF) {
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if (ch == term)
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break;
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strbuf_grow(sb, 1);
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sb->buf[sb->len++] = ch;
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}
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if (ch == EOF && sb->len == 0)
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return EOF;
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sb->buf[sb->len] = '\0';
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return 0;
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}
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int strbuf_read_file(struct strbuf *sb, const char *path, size_t hint)
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{
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int fd, len;
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fd = open(path, O_RDONLY);
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if (fd < 0)
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return -1;
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len = strbuf_read(sb, fd, hint);
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close(fd);
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if (len < 0)
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return -1;
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return len;
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}
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158
src/strbuf.h
Normal file
158
src/strbuf.h
Normal file
@ -0,0 +1,158 @@
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/*
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Copyright (c) 2005-2008 Junio C. Hamano et al.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License (version 2)
|
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as published by the Free Software Foundation.
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|
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
|
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
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GNU General Public License for more details.
|
||||
|
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You should have received a copy of the GNU General Public License
|
||||
along with this program; if not, write to the Free Software
|
||||
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef STRBUF_H
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#define STRBUF_H
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/*
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* Strbuf's can be use in many ways: as a byte array, or to store arbitrary
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* long, overflow safe strings.
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*
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* Strbufs has some invariants that are very important to keep in mind:
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*
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* 1. the ->buf member is always malloc-ed, hence strbuf's can be used to
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* build complex strings/buffers whose final size isn't easily known.
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*
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* It is NOT legal to copy the ->buf pointer away.
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* `strbuf_detach' is the operation that detachs a buffer from its shell
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* while keeping the shell valid wrt its invariants.
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*
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* 2. the ->buf member is a byte array that has at least ->len + 1 bytes
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* allocated. The extra byte is used to store a '\0', allowing the ->buf
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* member to be a valid C-string. Every strbuf function ensure this
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* invariant is preserved.
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*
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* Note that it is OK to "play" with the buffer directly if you work it
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* that way:
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*
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* strbuf_grow(sb, SOME_SIZE);
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* ... Here, the memory array starting at sb->buf, and of length
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* ... strbuf_avail(sb) is all yours, and you are sure that
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* ... strbuf_avail(sb) is at least SOME_SIZE.
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* strbuf_setlen(sb, sb->len + SOME_OTHER_SIZE);
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*
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* Of course, SOME_OTHER_SIZE must be smaller or equal to strbuf_avail(sb).
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*
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* Doing so is safe, though if it has to be done in many places, adding the
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* missing API to the strbuf module is the way to go.
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*
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* XXX: do _not_ assume that the area that is yours is of size ->alloc - 1
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* even if it's true in the current implementation. Alloc is somehow a
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* "private" member that should not be messed with.
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*/
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#include <assert.h>
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#include <sys/types.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdarg.h>
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extern char strbuf_slopbuf[];
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struct strbuf {
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size_t alloc;
|
||||
size_t len;
|
||||
char *buf;
|
||||
};
|
||||
|
||||
#define STRBUF_INIT { 0, 0, strbuf_slopbuf }
|
||||
|
||||
/*----- strbuf life cycle -----*/
|
||||
extern void strbuf_init(struct strbuf *, size_t);
|
||||
extern void strbuf_release(struct strbuf *);
|
||||
extern char *strbuf_detach(struct strbuf *, size_t *);
|
||||
extern void strbuf_attach(struct strbuf *, void *, size_t, size_t);
|
||||
static inline void strbuf_swap(struct strbuf *a, struct strbuf *b) {
|
||||
struct strbuf tmp = *a;
|
||||
*a = *b;
|
||||
*b = tmp;
|
||||
}
|
||||
|
||||
/*----- strbuf size related -----*/
|
||||
static inline size_t strbuf_avail(const struct strbuf *sb) {
|
||||
return sb->alloc ? sb->alloc - sb->len - 1 : 0;
|
||||
}
|
||||
|
||||
extern void strbuf_grow(struct strbuf *, size_t);
|
||||
|
||||
static inline void strbuf_setlen(struct strbuf *sb, size_t len) {
|
||||
if (!sb->alloc)
|
||||
strbuf_grow(sb, 0);
|
||||
assert(len < sb->alloc);
|
||||
sb->len = len;
|
||||
sb->buf[len] = '\0';
|
||||
}
|
||||
#define strbuf_reset(sb) strbuf_setlen(sb, 0)
|
||||
|
||||
/*----- content related -----*/
|
||||
extern void strbuf_trim(struct strbuf *);
|
||||
extern void strbuf_rtrim(struct strbuf *);
|
||||
extern void strbuf_ltrim(struct strbuf *);
|
||||
extern int strbuf_cmp(const struct strbuf *, const struct strbuf *);
|
||||
extern void strbuf_tolower(struct strbuf *);
|
||||
|
||||
extern struct strbuf **strbuf_split(const struct strbuf *, int delim);
|
||||
extern struct strbuf **strbuf_splitws(const struct strbuf *);
|
||||
extern void strbuf_list_free(struct strbuf **);
|
||||
extern size_t strbuf_list_len(struct strbuf **);
|
||||
|
||||
/*----- add data in your buffer -----*/
|
||||
static inline void strbuf_addch(struct strbuf *sb, int c) {
|
||||
strbuf_grow(sb, 1);
|
||||
sb->buf[sb->len++] = c;
|
||||
sb->buf[sb->len] = '\0';
|
||||
}
|
||||
|
||||
extern void strbuf_insert(struct strbuf *, size_t pos, const void *, size_t);
|
||||
extern void strbuf_remove(struct strbuf *, size_t pos, size_t len);
|
||||
|
||||
/* splice pos..pos+len with given data */
|
||||
extern void strbuf_splice(struct strbuf *, size_t pos, size_t len,
|
||||
const void *, size_t);
|
||||
|
||||
extern void strbuf_add(struct strbuf *, const void *, size_t);
|
||||
static inline void strbuf_addstr(struct strbuf *sb, const char *s) {
|
||||
strbuf_add(sb, s, strlen(s));
|
||||
}
|
||||
static inline void strbuf_addbuf(struct strbuf *sb, const struct strbuf *sb2) {
|
||||
strbuf_add(sb, sb2->buf, sb2->len);
|
||||
}
|
||||
extern void strbuf_adddup(struct strbuf *sb, size_t pos, size_t len);
|
||||
|
||||
typedef size_t (*expand_fn_t) (struct strbuf *sb, const char *placeholder, void *context);
|
||||
extern void strbuf_expand(struct strbuf *sb, const char *format, expand_fn_t fn, void *context);
|
||||
struct strbuf_expand_dict_entry {
|
||||
const char *placeholder;
|
||||
const char *value;
|
||||
};
|
||||
extern size_t strbuf_expand_dict_cb(struct strbuf *sb, const char *placeholder, void *context);
|
||||
|
||||
__attribute__((format(printf,2,3)))
|
||||
extern void strbuf_addf(struct strbuf *sb, const char *fmt, ...);
|
||||
extern void strbuf_vaddf(struct strbuf *sb, const char *fmt, va_list ap);
|
||||
|
||||
extern size_t strbuf_fread(struct strbuf *, size_t, FILE *);
|
||||
/* XXX: if read fails, any partial read is undone */
|
||||
extern ssize_t strbuf_read(struct strbuf *, int fd, size_t hint);
|
||||
extern ssize_t strbuf_write(struct strbuf *sb, int fd);
|
||||
extern int strbuf_read_file(struct strbuf *sb, const char *path, size_t hint);
|
||||
|
||||
extern int strbuf_getline(struct strbuf *, FILE *, int);
|
||||
|
||||
extern void stripspace(struct strbuf *buf, int skip_comments);
|
||||
extern int launch_editor(const char *path, struct strbuf *buffer, const char *const *env);
|
||||
|
||||
#endif /* STRBUF_H */
|
Loading…
x
Reference in New Issue
Block a user