X-Git-Url: https://git.tokkee.org/?p=sysdb.git;a=blobdiff_plain;f=src%2Futils%2Fstrbuf.c;h=ee419b7ea20994efaeeaac3d6ae1d246c402dcb0;hp=993b086d0ef0adbcb060faf046cd7390f548e4bd;hb=edba65afec8c547fb6c02346eda68595ce9a5839;hpb=db10803daef8bf91971171c86f22abebcd74d4eb

diff --git a/src/utils/strbuf.c b/src/utils/strbuf.c
index 993b086..ee419b7 100644
--- a/src/utils/strbuf.c
+++ b/src/utils/strbuf.c
@@ -34,6 +34,8 @@
 #include <stdarg.h>
 #include <string.h>
 
+#include <unistd.h>
+
 /*
  * private data structures
  */
@@ -117,9 +119,14 @@ sdb_strbuf_vappend(sdb_strbuf_t *strbuf, const char *fmt, va_list ap)
 
 	assert((strbuf->size == 0) || (strbuf->string[strbuf->pos] == '\0'));
 
-	if (strbuf->pos >= strbuf->size)
+	if (! strbuf->size) {
 		/* use some arbitrary but somewhat reasonable default */
-		if (strbuf_resize(strbuf, strbuf->size ? 2 * strbuf->size : 64))
+		if (strbuf_resize(strbuf, 64))
+			return -1;
+	}
+	/* make sure to reserve space for the nul-byte */
+	else if (strbuf->pos >= strbuf->size - 1)
+		if (strbuf_resize(strbuf, 2 * strbuf->size))
 			return -1;
 
 	assert(strbuf->size && strbuf->string);
@@ -135,8 +142,12 @@ sdb_strbuf_vappend(sdb_strbuf_t *strbuf, const char *fmt, va_list ap)
 		return status;
 	}
 
-	if ((size_t)status >= strbuf->size - strbuf->pos) {
-		strbuf_resize(strbuf, (size_t)status + 1);
+	/* 'status' does not include nul-byte */
+	if ((size_t)status >= strbuf->size - strbuf->pos - 1) {
+		if (strbuf_resize(strbuf, strbuf->size + (size_t)status)) {
+			va_end(aq);
+			return -1;
+		}
 
 		/* reset string and try again */
 		strbuf->string[strbuf->pos] = '\0';
@@ -233,6 +244,23 @@ sdb_strbuf_memcpy(sdb_strbuf_t *strbuf, const void *data, size_t n)
 	return sdb_strbuf_memappend(strbuf, data, n);
 } /* sdb_strbuf_memcpy */
 
+ssize_t
+sdb_strbuf_read(sdb_strbuf_t *strbuf, int fd, size_t n)
+{
+	ssize_t ret;
+
+	if (! strbuf)
+		return -1;
+
+	if (strbuf_resize(strbuf, strbuf->pos + n + 1))
+		return -1;
+
+	ret = read(fd, strbuf->string + strbuf->pos, n);
+	if (ret > 0)
+		strbuf->pos += (size_t)ret;
+	return ret;
+} /* sdb_strbuf_read */
+
 ssize_t
 sdb_strbuf_chomp(sdb_strbuf_t *strbuf)
 {
@@ -254,6 +282,45 @@ sdb_strbuf_chomp(sdb_strbuf_t *strbuf)
 	return ret;
 } /* sdb_strbuf_chomp */
 
+void
+sdb_strbuf_skip(sdb_strbuf_t *strbuf, size_t offset, size_t n)
+{
+	char *start;
+	size_t len;
+
+	if ((! strbuf) || (! n))
+		return;
+
+	if (offset >= strbuf->pos)
+		return;
+
+	len = strbuf->pos - offset;
+
+	if (n >= len) {
+		strbuf->string[offset] = '\0';
+		strbuf->pos = offset;
+		return;
+	}
+
+	assert(offset + n < strbuf->pos);
+	assert(offset < strbuf->pos);
+
+	start = strbuf->string + offset;
+	memmove(start, start + n, strbuf->pos - n);
+	strbuf->pos -= n;
+	strbuf->string[strbuf->pos] = '\0';
+} /* sdb_strbuf_skip */
+
+void
+sdb_strbuf_clear(sdb_strbuf_t *strbuf)
+{
+	if ((! strbuf) || (! strbuf->size))
+		return;
+
+	strbuf->string[0] = '\0';
+	strbuf->pos = 0;
+} /* sdb_strbuf_clear */
+
 const char *
 sdb_strbuf_string(sdb_strbuf_t *strbuf)
 {