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authormidipix <writeonce@midipix.org>2024-02-08 06:24:02 +0000
committermidipix <writeonce@midipix.org>2024-02-08 06:24:02 +0000
commitc8d21a38d6941303527af15b95d887a053aa0df6 (patch)
treed34a41c2ce495f290bef4dc4b468e926b3cc38d7 /src
parentdd658df0cf3a5267a148a47191e221fca012eecc (diff)
downloadslibtool-c8d21a38d6941303527af15b95d887a053aa0df6.tar.bz2
slibtool-c8d21a38d6941303527af15b95d887a053aa0df6.tar.xz
slbt_store_archive(): initial implementation.
Diffstat (limited to 'src')
-rw-r--r--src/arbits/slbt_archive_store.c143
1 files changed, 143 insertions, 0 deletions
diff --git a/src/arbits/slbt_archive_store.c b/src/arbits/slbt_archive_store.c
new file mode 100644
index 0000000..d8281b0
--- /dev/null
+++ b/src/arbits/slbt_archive_store.c
@@ -0,0 +1,143 @@
+/*******************************************************************/
+/* slibtool: a skinny libtool implementation, written in C */
+/* Copyright (C) 2016--2024 SysDeer Technologies, LLC */
+/* Released under the Standard MIT License; see COPYING.SLIBTOOL. */
+/*******************************************************************/
+
+#include <time.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stddef.h>
+#include <limits.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <inttypes.h>
+#include <sys/stat.h>
+
+#include <slibtool/slibtool.h>
+#include <slibtool/slibtool_arbits.h>
+#include "slibtool_ar_impl.h"
+#include "slibtool_driver_impl.h"
+#include "slibtool_errinfo_impl.h"
+
+/****************************************************/
+/* As elsewhere in slibtool, file-system operations */
+/* utilizie the _at variants of the relevant posix */
+/* interfaces. In the case of archives, that means */
+/* passing dctx->fdctx->fdcwd as the _fdat_ param, */
+/* where dctx is the driver context which was used */
+/* with slbt_get_archive_ctx(). */
+/************************************************** */
+
+#define PPRIX64 "%"PRIx64
+
+int slbt_store_archive(
+ struct slbt_archive_ctx * arctx,
+ const char * path,
+ mode_t mode)
+{
+ const struct slbt_driver_ctx * dctx;
+ struct stat st;
+ int fdat;
+ int fdtmp;
+ char * mark;
+ char * slash;
+ size_t buflen;
+ size_t nbytes;
+ ssize_t written;
+ char buf[PATH_MAX];
+
+ /* init dctx */
+ if (!(dctx = slbt_get_archive_ictx(arctx)->dctx))
+ return -1;
+
+ /* validation */
+ if (strlen(path) >= PATH_MAX)
+ return SLBT_CUSTOM_ERROR(
+ dctx,
+ SLBT_ERR_FLOW_ERROR);
+
+ /**************************************************/
+ /* create temporary file in the target directory */
+ /* */
+ /* the tmpfile name pattern involes the inode */
+ /* of the target directory, a local stack address */
+ /* in the calling thread, the current time, and */
+ /* finally the pid of the current process. */
+ /**************************************************/
+
+ memset(buf,0,sizeof(buf));
+ strcpy(buf,path);
+
+ fdat = slbt_driver_fdcwd(dctx);
+
+ mark = (slash = strrchr(buf,'/'))
+ ? slash : buf;
+
+ if (slash) {
+ *++mark = '\0';
+
+ if (fstatat(fdat,buf,&st,0) < 0)
+ return SLBT_SYSTEM_ERROR(
+ dctx,0);
+ } else {
+ if (fstatat(fdat,".",&st,0) < 0)
+ return SLBT_SYSTEM_ERROR(
+ dctx,0);
+ }
+
+ buflen = sizeof(buf) - (mark - buf);
+ nbytes = snprintf(
+ mark,
+ buflen,
+ ".slibtool.tmpfile"
+ ".inode."PPRIX64
+ ".time."PPRIX64
+ ".salt.%p"
+ ".pid.%d"
+ ".tmp",
+ st.st_ino,
+ time(0),&buf,
+ getpid());
+
+ if (nbytes >= buflen)
+ return SLBT_CUSTOM_ERROR(
+ dctx,
+ SLBT_ERR_FLOW_ERROR);
+
+ if ((fdtmp = openat(fdat,buf,O_WRONLY|O_CREAT|O_EXCL,mode)) < 0)
+ return SLBT_SYSTEM_ERROR(dctx,0);
+
+ /* set archive size */
+ if (ftruncate(fdtmp,arctx->map->map_size) < 0)
+ return SLBT_SYSTEM_ERROR(dctx,0);
+
+ /* write archive */
+ mark = arctx->map->map_addr;
+ nbytes = arctx->map->map_size;
+
+ for (; nbytes; ) {
+ written = write(fdtmp,mark,nbytes);
+
+ while ((written < 0) && (errno == EINTR))
+ written = write(fdtmp,mark,nbytes);
+
+ if (written < 0) {
+ unlinkat(fdat,buf,0);
+ return SLBT_SYSTEM_ERROR(dctx,0);
+ };
+
+ nbytes -= written;
+ mark += written;
+ }
+
+ /* finalize (atomically) */
+ if (renameat(fdat,buf,fdat,path) < 0) {
+ unlinkat(fdat,buf,0);
+ return SLBT_SYSTEM_ERROR(dctx,0);
+ }
+
+ /* yay */
+ return 0;
+}