File sed-follow_symlinks.patch of Package sed
Index: sed-4.1.5/sed/sed.c
===================================================================
--- sed-4.1.5.orig/sed/sed.c
+++ sed-4.1.5/sed/sed.c
@@ -70,6 +70,11 @@ bool no_default_output = false;
/* If set, reset line counts on every new file. */
bool separate_files = false;
+#ifdef ENABLE_FOLLOW_SYMLINKS
+/* If set, follow symlinks when processing in place */
+bool follow_symlinks = false;
+#endif
+
/* How do we edit files in-place? (we don't if NULL) */
char *in_place_extension = NULL;
@@ -105,6 +110,10 @@ Usage: %s [OPTION]... {script-only-if-no
add the script to the commands to be executed\n"));
fprintf(out, _(" -f script-file, --file=script-file\n\
add the contents of script-file to the commands to be executed\n"));
+#ifdef ENABLE_FOLLOW_SYMLINKS
+ fprintf(out, _(" --follow-symlinks\n\
+ follow symlinks when processing in place\n"));
+#endif
fprintf(out, _(" -i[SUFFIX], --in-place[=SUFFIX]\n\
edit files in place (makes backup if extension supplied)\n"));
fprintf(out, _(" -l N, --line-length=N\n\
@@ -163,6 +172,9 @@ main(argc, argv)
{"unbuffered", 0, NULL, 'u'},
{"version", 0, NULL, 'v'},
{"help", 0, NULL, 'h'},
+#ifdef ENABLE_FOLLOW_SYMLINKS
+ {"follow-symlinks", 0, NULL, 'F'},
+#endif
{NULL, 0, NULL, 0}
};
@@ -215,6 +227,12 @@ main(argc, argv)
the_program = compile_file(the_program, optarg);
break;
+#ifdef ENABLE_FOLLOW_SYMLINKS
+ case 'F':
+ follow_symlinks = true;
+ break;
+#endif
+
case 'i':
separate_files = true;
if (optarg == NULL)
Index: sed-4.1.5/lib/utils.c
===================================================================
--- sed-4.1.5.orig/lib/utils.c
+++ sed-4.1.5/lib/utils.c
@@ -35,6 +35,13 @@
# include <stdlib.h>
#endif /* HAVE_STDLIB_H */
+#ifdef ENABLE_FOLLOW_SYMLINKS
+# include <sys/types.h>
+# include <sys/stat.h>
+# include <unistd.h>
+# include <libgen.h>
+#endif /* ENABLE_FOLLOW_SYMLINKS */
+
#include "utils.h"
const char *myname;
@@ -315,6 +322,65 @@ do_ck_fclose(fp)
}
+#ifdef ENABLE_FOLLOW_SYMLINKS
+static char buf[2048], buf2[2048];
+static size_t bufsize = sizeof (buf);
+
+/* Follow symlink and panic if something fails. Returned value is
+ ultimate symlink target, stored in temporary buffer. You need to
+ strdup the return value, if you intend to use it later.*/
+const char *
+ck_follow_symlink(const char * fname)
+{
+ static struct stat statbuf;
+ int err;
+ char * dir;
+
+ if (strlen (fname) >= bufsize)
+ panic("ck_follow_symlink: file name too long");
+ strcpy (buf, fname);
+
+ while (1)
+ {
+ err = lstat (buf, &statbuf);
+
+ if (err != 0)
+ panic("ck_follow_symlink: couldn't lstat %s: %s", buf, strerror(errno));
+
+ if ((statbuf.st_mode & S_IFLNK) == S_IFLNK)
+ {
+ err = readlink (buf, buf2, bufsize);
+
+ if (err < 0)
+ panic("ck_follow_symlink: readlink failed on %s: %s", buf, strerror(errno));
+ else if (err == bufsize)
+ panic("ck_follow_symlink: pointee name too long");
+ else
+ buf2 [err] = '\0';
+
+ /* need to handle relative paths with care */
+ if (buf2[0] != '/')
+ {
+ dir = dirname (buf); // dir part of orig path
+ int len = strlen (dir); // orig path len
+ buf[len] = '/';
+ strncpy (buf+len+1, buf2, bufsize - len - 1);
+ if (buf[bufsize-1] != 0)
+ panic("ck_follow_symlink: pointee name too long");
+ }
+ else
+ {
+ strcpy (buf, buf2);
+ }
+ }
+ else
+ break;
+ }
+
+ return buf;
+}
+#endif /* ENABLE_FOLLOW_SYMLINKS */
+
/* Panic on failing rename */
void
ck_rename (from, to, unlink_if_fail)
Index: sed-4.1.5/lib/utils.h
===================================================================
--- sed-4.1.5.orig/lib/utils.h
+++ sed-4.1.5/lib/utils.h
@@ -27,6 +27,9 @@ void ck_fwrite P_((const VOID *ptr, size
size_t ck_fread P_((VOID *ptr, size_t size, size_t nmemb, FILE *stream));
void ck_fflush P_((FILE *stream));
void ck_fclose P_((FILE *stream));
+#ifdef ENABLE_FOLLOW_SYMLINKS
+const char *ck_follow_symlink P_((const char *path));
+#endif
size_t ck_getline P_((char **text, size_t *buflen, FILE *stream));
FILE * ck_mkstemp P_((char **p_filename, char *tmpdir, char *base));
void ck_rename P_((const char *from, const char *to, const char *unlink_if_fail));
Index: sed-4.1.5/sed/execute.c
===================================================================
--- sed-4.1.5.orig/sed/execute.c
+++ sed-4.1.5/sed/execute.c
@@ -711,16 +711,34 @@ closedown(input)
if (in_place_extension && output_file.fp != NULL)
{
+#ifdef ENABLE_FOLLOW_SYMLINKS
+ char *target_name;
+
+ if (follow_symlinks)
+ target_name = ck_strdup(ck_follow_symlink(input->in_file_name));
+ else
+ target_name = ck_strdup(input->in_file_name);
+#else
+ const char *target_name;
+
+ target_name = input->in_file_name;
+#endif
+
ck_fclose (output_file.fp);
if (strcmp(in_place_extension, "*") != 0)
{
- char *backup_file_name = get_backup_file_name(input->in_file_name);
- ck_rename (input->in_file_name, backup_file_name, input->out_file_name);
+ char *backup_file_name = get_backup_file_name(target_name);
+ ck_rename (target_name, backup_file_name, input->out_file_name);
+
free (backup_file_name);
}
- ck_rename (input->out_file_name, input->in_file_name, input->out_file_name);
+ ck_rename (input->out_file_name, target_name, input->out_file_name);
+
free (input->out_file_name);
+#ifdef ENABLE_FOLLOW_SYMLINKS
+ free (target_name);
+#endif
}
input->fp = NULL;
Index: sed-4.1.5/sed/sed.h
===================================================================
--- sed-4.1.5.orig/sed/sed.h
+++ sed-4.1.5/sed/sed.h
@@ -219,6 +219,11 @@ extern bool no_default_output;
/* If set, reset line counts on every new file. */
extern bool separate_files;
+#ifdef ENABLE_FOLLOW_SYMLINKS
+/* If set, follow symlinks when invoked with -i option */
+extern bool follow_symlinks;
+#endif
+
/* Do we need to be pedantically POSIX compliant? */
extern enum posixicity_types posixicity;
Index: sed-4.1.5/configure.ac
===================================================================
--- sed-4.1.5.orig/configure.ac
+++ sed-4.1.5/configure.ac
@@ -117,6 +117,13 @@ enable_html=no)
AM_CONDITIONAL(BUILD_HTML, test "x$enable_html" != xno)
+# follow symlinks
+AC_CHECK_FUNC(lstat, have_lstat=yes)
+AC_CHECK_FUNC(readlink, have_readlink=yes)
+if test "x$have_lstat" = xyes -a "x$have_readlink" = xyes; then
+ AC_DEFINE(ENABLE_FOLLOW_SYMLINKS, ,[Follow symlinks when processing in place])
+fi
+
: ${TEXI2HTML=texi2html -monolithic}
AC_SUBST(TEXI2HTML)
