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-rw-r--r--lib/Makemodule.am2
-rw-r--r--lib/include/util.h18
-rw-r--r--lib/src/rdline.c60
-rw-r--r--lib/src/rdsvc.c31
-rw-r--r--lib/src/strexpand.c72
5 files changed, 79 insertions, 104 deletions
diff --git a/lib/Makemodule.am b/lib/Makemodule.am
index 1d7da73..221a15b 100644
--- a/lib/Makemodule.am
+++ b/lib/Makemodule.am
@@ -2,7 +2,7 @@ HEADRS = lib/include/util.h lib/include/service.h lib/include/telinit.h
libinit_a_SOURCES = lib/src/delsvc.c lib/src/rdline.c lib/src/svcmap.c
libinit_a_SOURCES += lib/src/splitkv.c lib/src/enum_by_name.c
-libinit_a_SOURCES += lib/src/strexpand.c lib/src/rdsvc.c lib/src/svcscan.c
+libinit_a_SOURCES += lib/src/rdsvc.c lib/src/svcscan.c
libinit_a_SOURCES += lib/src/del_svc_list.c lib/src/svc_tsort.c
libinit_a_SOURCES += lib/src/opensock.c lib/src/enum_to_name.c $(HEADRS)
libinit_a_CPPFLAGS = $(AM_CPPFLAGS)
diff --git a/lib/include/util.h b/lib/include/util.h
index 6943567..e99be3b 100644
--- a/lib/include/util.h
+++ b/lib/include/util.h
@@ -55,8 +55,17 @@ typedef struct {
it with a backslash.
- If a second, coresponding '"' is not found, processing fails with
errno set to EILSEQ.
+ - If a '%' character is encountered, the next character is expected
+ to be a single digit index into argv. If it is not a digit or
+ outside the bounds set by argc, processing fails and sets errno
+ to EINVAL. On success, the argv value is inserted and processed
+ as described above.
+ - A '%' character can be escaped by writing '%%' or, if inside
+ a double quite string, by writing \%.
+ - An attempt to use such an indexed argument inside an argument
+ expansion, results in failure with errno set to ELOOP.
*/
-char *rdline(int fd);
+char *rdline(int fd, int argc, const char *const *argv);
/*
Split a line of the shape "key = value" into key and value part.
@@ -88,12 +97,5 @@ const enum_map_t *enum_by_name(const enum_map_t *map, const char *name);
*/
const char *enum_to_name(const enum_map_t *map, int value);
-/*
- Create a copy of the input string inp, but replace all occourances
- of %<number> with argv[number] if the number is within the bounds
- specified by argc.
-*/
-char *strexpand(const char *inp, size_t argc, const char *const *argv);
-
#endif /* UTIL_H */
diff --git a/lib/src/rdline.c b/lib/src/rdline.c
index 4e72a25..d6c4078 100644
--- a/lib/src/rdline.c
+++ b/lib/src/rdline.c
@@ -27,33 +27,45 @@ enum {
STATE_STRING = 1,
STATE_STRING_ESC = 2,
STATE_COMMENT = 3,
+ STATE_ARG = 4,
};
-char *rdline(int fd)
+char *rdline(int fd, int argc, const char *const *argv)
{
size_t i = 0, bufsiz = 0, newsz;
int ret, state = STATE_INITIAL;
char c, *new, *buffer = NULL;
+ const char *argstr = NULL;
for (;;) {
- switch (read(fd, &c, 1)) {
- case 0:
- if (i == 0) {
- errno = 0;
- return NULL;
- }
- c = '\0';
- break;
- case 1:
- if (c == '\n')
+ if (argstr == NULL) {
+ switch (read(fd, &c, 1)) {
+ case 0:
+ if (i == 0) {
+ errno = 0;
+ return NULL;
+ }
c = '\0';
- break;
- default:
- if (errno == EINTR)
+ break;
+ case 1:
+ break;
+ default:
+ if (errno == EINTR)
+ continue;
+ goto fail;
+ }
+ } else {
+ c = *(argstr++);
+
+ if (c == '\0') {
+ argstr = NULL;
continue;
- goto fail;
+ }
}
+ if (c == '\n')
+ c = '\0';
+
switch (state) {
case STATE_STRING:
if (c == '\\')
@@ -68,6 +80,20 @@ char *rdline(int fd)
if (c != '\0')
continue;
break;
+ case STATE_ARG:
+ state = STATE_INITIAL;
+ if (c == '%')
+ break;
+ if (!isdigit(c) || (c - '0') >= argc) {
+ errno = EINVAL;
+ goto fail;
+ }
+ if (argstr != NULL) {
+ errno = ELOOP;
+ goto fail;
+ }
+ argstr = argv[c - '0'];
+ continue;
default:
if (isspace(c))
c = ' ';
@@ -77,6 +103,10 @@ char *rdline(int fd)
state = STATE_COMMENT;
continue;
}
+ if (c == '%') {
+ state = STATE_ARG;
+ continue;
+ }
if (c == '"')
state = STATE_STRING;
break;
diff --git a/lib/src/rdsvc.c b/lib/src/rdsvc.c
index ee898c3..b186cd9 100644
--- a/lib/src/rdsvc.c
+++ b/lib/src/rdsvc.c
@@ -171,7 +171,7 @@ static const struct {
service_t *rdsvc(int dirfd, const char *filename)
{
- const char *arg, *args[1];
+ const char *arg, *args[1], *error;
char *line, *key, *value;
size_t i, argc, lineno;
service_t *svc;
@@ -213,15 +213,30 @@ service_t *rdsvc(int dirfd, const char *filename)
for (lineno = 1; ; ++lineno) {
errno = 0;
- line = rdline(fd);
+ line = rdline(fd, argc, args);
if (line == NULL) {
- if (errno != 0) {
- fprintf(stderr, "read: %s: %zu: %s\n",
- filename, lineno, strerror(errno));
- goto fail;
+ if (errno == 0)
+ break;
+
+ switch (errno) {
+ case EINVAL:
+ error = "error in argument expansion";
+ break;
+ case ELOOP:
+ error = "recursive argument expansion";
+ break;
+ case EILSEQ:
+ error = "missing \"";
+ break;
+ default:
+ error = strerror(errno);
+ break;
}
- break;
+
+ fprintf(stderr, "%s: %zu: %s\n",
+ filename, lineno, error);
+ goto fail;
}
if (splitkv(line, &key, &value)) {
@@ -258,7 +273,7 @@ service_t *rdsvc(int dirfd, const char *filename)
goto fail_line;
}
- value = strexpand(value, argc, args);
+ value = strdup(value);
if (value == NULL) {
fputs("out of memory", stderr);
goto fail_line;
diff --git a/lib/src/strexpand.c b/lib/src/strexpand.c
deleted file mode 100644
index 58b69a0..0000000
--- a/lib/src/strexpand.c
+++ /dev/null
@@ -1,72 +0,0 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
-/*
- * Copyright (C) 2018 - David Oberhollenzer
- *
- * This program 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 3 of the License, or
- * (at your option) any later version.
- *
- * This program 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 <string.h>
-#include <stdlib.h>
-#include <ctype.h>
-
-#include "util.h"
-
-char *strexpand(const char *inp, size_t argc, const char *const *argv)
-{
- char *out, *dst;
- const char *ptr;
- size_t i, len;
-
- ptr = inp;
- len = 0;
-
- while (*ptr != '\0') {
- if (ptr[0] == '%' && isdigit(ptr[1])) {
- i = ptr[1] - '0';
- if (i < argc)
- len += strlen(argv[i]);
- ptr += 2;
- } else if (ptr[0] == '%' && ptr[1] == '%') {
- ptr += 2;
- len += 1;
- } else {
- ++ptr;
- ++len;
- }
- }
-
- out = calloc(1, len + 1);
- if (out == NULL)
- return NULL;
-
- dst = out;
-
- while (*inp != '\0') {
- if (inp[0] == '%' && isdigit(inp[1])) {
- i = inp[1] - '0';
- if (i < argc) {
- len = strlen(argv[i]);
- memcpy(dst, argv[i], len);
- dst += len;
- }
- inp += 2;
- } else if (inp[0] == '%' && inp[1] == '%') {
- *(dst++) = '%';
- inp += 2;
- } else {
- *(dst++) = *(inp++);
- }
- }
-
- return out;
-}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-02 22:12:45 +0000