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authorDenis Vlasenko2008-07-08 05:14:36 +0000
committerDenis Vlasenko2008-07-08 05:14:36 +0000
commitdeeed59de0a9bcc068ebd14d7496a6b26e45b890 (patch)
tree7dafd469e9f6bca107adbf930fe77fff9958a0b6 /libbb/read.c
parent493829207c1c2a36d55aaa13abf806533d0cb87f (diff)
downloadbusybox-deeed59de0a9bcc068ebd14d7496a6b26e45b890.zip
busybox-deeed59de0a9bcc068ebd14d7496a6b26e45b890.tar.gz
libbb: introduce and use xrealloc_vector
function old new delta xrealloc_vector_helper - 51 +51 create_list 84 99 +15 getopt_main 690 695 +5 passwd_main 1049 1053 +4 get_cached 85 89 +4 msh_main 1377 1380 +3 add_match 42 41 -1 read_lines 720 718 -2 grave 1068 1066 -2 fill_match_lines 143 141 -2 add_to_dirlist 67 65 -2 add_input_file 49 47 -2 act 252 250 -2 fsck_main 2252 2246 -6 man_main 765 757 -8 bb_internal_initgroups 228 220 -8 cut_main 1052 1041 -11 add_edge_to_node 55 43 -12 dpkg_main 3851 3835 -16 ifupdown_main 2202 2178 -24 sort_main 838 812 -26 ------------------------------------------------------------------------------ (add/remove: 1/0 grow/shrink: 5/15 up/down: 82/-124) Total: -42 bytes
Diffstat (limited to 'libbb/read.c')
-rw-r--r--libbb/read.c49
1 files changed, 49 insertions, 0 deletions
diff --git a/libbb/read.c b/libbb/read.c
index 7b80412..405e216 100644
--- a/libbb/read.c
+++ b/libbb/read.c
@@ -291,3 +291,52 @@ void* FAST_FUNC xmalloc_xopen_read_close(const char *filename, size_t *sizep)
bb_perror_msg_and_die("can't read '%s'", filename);
return buf;
}
+
+/* libbb candidate */
+#if 0
+static void *xmalloc_read(int fd, size_t *sizep)
+{
+ char *buf;
+ size_t size, rd_size, total;
+ off_t to_read;
+ struct stat st;
+
+ to_read = sizep ? *sizep : INT_MAX; /* max to read */
+
+ /* Estimate file size */
+ st.st_size = 0; /* in case fstat fails, assume 0 */
+ fstat(fd, &st);
+ /* /proc/N/stat files report st_size 0 */
+ /* In order to make such files readable, we add small const */
+ size = (st.st_size | 0x3ff) + 1;
+
+ total = 0;
+ buf = NULL;
+ while (1) {
+ if (to_read < size)
+ size = to_read;
+ buf = xrealloc(buf, total + size + 1);
+ rd_size = full_read(fd, buf + total, size);
+ if ((ssize_t)rd_size < 0) { /* error */
+ free(buf);
+ return NULL;
+ }
+ total += rd_size;
+ if (rd_size < size) /* EOF */
+ break;
+ to_read -= rd_size;
+ if (to_read <= 0)
+ break;
+ /* grow by 1/8, but in [1k..64k] bounds */
+ size = ((total / 8) | 0x3ff) + 1;
+ if (size > 64*1024)
+ size = 64*1024;
+ }
+ xrealloc(buf, total + 1);
+ buf[total] = '\0';
+
+ if (sizep)
+ *sizep = total;
+ return buf;
+}
+#endif