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Diffstat (limited to '')
-rw-r--r-- | lib/dpkg/varbuf.c | 206 |
1 files changed, 206 insertions, 0 deletions
diff --git a/lib/dpkg/varbuf.c b/lib/dpkg/varbuf.c new file mode 100644 index 0000000..ee757bc --- /dev/null +++ b/lib/dpkg/varbuf.c @@ -0,0 +1,206 @@ +/* + * libdpkg - Debian packaging suite library routines + * varbuf.c - variable length expandable buffer handling + * + * Copyright © 1994,1995 Ian Jackson <ijackson@chiark.greenend.org.uk> + * Copyright © 2008-2015 Guillem Jover <guillem@debian.org> + * + * This is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <https://www.gnu.org/licenses/>. + */ + +#include <config.h> +#include <compat.h> + +#include <string.h> +#include <stdlib.h> +#include <stdio.h> + +#include <dpkg/i18n.h> +#include <dpkg/dpkg.h> +#include <dpkg/dpkg-db.h> + +void +varbuf_add_char(struct varbuf *v, int c) +{ + varbuf_grow(v, 1); + v->buf[v->used++]= c; +} + +void +varbuf_dup_char(struct varbuf *v, int c, size_t n) +{ + varbuf_grow(v, n); + memset(v->buf + v->used, c, n); + v->used += n; +} + +void +varbuf_map_char(struct varbuf *v, int c_src, int c_dst) +{ + size_t i; + + for (i = 0; i < v->used; i++) + if (v->buf[i] == c_src) + v->buf[i] = c_dst; +} + +int +varbuf_printf(struct varbuf *v, const char *fmt, ...) +{ + int r; + va_list args; + + va_start(args, fmt); + r = varbuf_vprintf(v, fmt, args); + va_end(args); + + return r; +} + +int +varbuf_vprintf(struct varbuf *v, const char *fmt, va_list args) +{ + va_list args_copy; + int needed, r; + + va_copy(args_copy, args); + needed = vsnprintf(NULL, 0, fmt, args_copy); + va_end(args_copy); + + if (needed < 0) + ohshite(_("error formatting string into varbuf variable")); + + varbuf_grow(v, needed + 1); + + r = vsnprintf(v->buf + v->used, needed + 1, fmt, args); + if (r < 0) + ohshite(_("error formatting string into varbuf variable")); + + v->used += r; + + return r; +} + +void +varbuf_add_buf(struct varbuf *v, const void *s, size_t size) +{ + varbuf_grow(v, size); + memcpy(v->buf + v->used, s, size); + v->used += size; +} + +void +varbuf_end_str(struct varbuf *v) +{ + varbuf_grow(v, 1); + v->buf[v->used] = '\0'; +} + +const char * +varbuf_get_str(struct varbuf *v) +{ + varbuf_end_str(v); + + return v->buf; +} + +struct varbuf * +varbuf_new(size_t size) +{ + struct varbuf *v; + + v = m_malloc(sizeof(*v)); + varbuf_init(v, size); + + return v; +} + +void +varbuf_init(struct varbuf *v, size_t size) +{ + v->used = 0; + v->size = size; + if (size) + v->buf = m_malloc(size); + else + v->buf = NULL; +} + +void +varbuf_reset(struct varbuf *v) +{ + v->used= 0; +} + +void +varbuf_grow(struct varbuf *v, size_t need_size) +{ + /* Make sure the varbuf is in a sane state. */ + if (v->size < v->used) + internerr("varbuf used(%zu) > size(%zu)", v->used, v->size); + + /* Check if we already have enough room. */ + if ((v->size - v->used) >= need_size) + return; + + v->size = (v->size + need_size) * 2; + v->buf = m_realloc(v->buf, v->size); +} + +void +varbuf_trunc(struct varbuf *v, size_t used_size) +{ + /* Make sure the caller does not claim more than available. */ + if (v->size < used_size) + internerr("varbuf new_used(%zu) > size(%zu)", used_size, v->size); + + v->used = used_size; +} + +void +varbuf_snapshot(struct varbuf *v, struct varbuf_state *vs) +{ + vs->used = v->used; +} + +void +varbuf_rollback(struct varbuf *v, struct varbuf_state *vs) +{ + varbuf_trunc(v, vs->used); +} + +char * +varbuf_detach(struct varbuf *v) +{ + char *buf = v->buf; + + v->buf = NULL; + v->size = 0; + v->used = 0; + + return buf; +} + +void +varbuf_destroy(struct varbuf *v) +{ + free(v->buf); v->buf=NULL; v->size=0; v->used=0; +} + +void +varbuf_free(struct varbuf *v) +{ + free(v->buf); + free(v); +} |