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authorDenis Vlasenko2007-05-16 12:52:15 +0000
committerDenis Vlasenko2007-05-16 12:52:15 +0000
commit3e7b0e61200b118fd83f56fc3ebaeedba455600e (patch)
tree67db0a35e381b2c81b197e7b360d10131927e906 /shell
parent1f4cf517f5803b0e300906c487d365a331122091 (diff)
downloadbusybox-3e7b0e61200b118fd83f56fc3ebaeedba455600e.zip
busybox-3e7b0e61200b118fd83f56fc3ebaeedba455600e.tar.gz
hush: simplify read builtin; fix set_local_var (misplaced 'goto skip;')
Diffstat (limited to 'shell')
-rw-r--r--shell/hush.c60
1 files changed, 18 insertions, 42 deletions
diff --git a/shell/hush.c b/shell/hush.c
index e3dd666..2e78e4a 100644
--- a/shell/hush.c
+++ b/shell/hush.c
@@ -854,32 +854,24 @@ static int builtin_pwd(char **argv ATTRIBUTE_UNUSED)
/* built-in 'read VAR' handler */
static int builtin_read(char **argv)
{
- int res;
+ char string[BUFSIZ];
+ char *p;
+ const char *name = argv[1] ? argv[1] : "REPLY";
+ int name_len = strlen(name);
- if (argv[1]) {
- char string[BUFSIZ];
- char *var = NULL;
-
- string[0] = '\0'; /* In case stdin has only EOF */
- /* read string */
- fgets(string, sizeof(string), stdin);
- chomp(string);
- var = malloc(strlen(argv[1]) + strlen(string) + 2);
- if (var) {
- sprintf(var, "%s=%s", argv[1], string);
- res = set_local_var(var, 0);
- } else
- res = -1;
- if (res)
- bb_perror_msg("read");
- free(var); /* So not move up to avoid breaking errno */
- return res;
- }
- do res = getchar(); while (res != '\n' && res != EOF);
- return 0;
+ if (name_len >= sizeof(string) - 2)
+ return EXIT_FAILURE;
+ strcpy(string, name);
+ p = string + name_len;
+ *p++ = '=';
+ *p = '\0'; /* In case stdin has only EOF */
+ /* read string. name_len+1 chars are already used by 'name=' */
+ fgets(p, sizeof(string) - 1 - name_len, stdin);
+ chomp(p);
+ return set_local_var(string, 0);
}
-/* built-in 'set VAR=value' handler */
+/* built-in 'set [VAR=value]' handler */
static int builtin_set(char **argv)
{
char *temp = argv[1];
@@ -959,7 +951,7 @@ static int builtin_umask(char **argv)
/* built-in 'unset VAR' handler */
static int builtin_unset(char **argv)
{
- /* bash returned already true */
+ /* bash always returns true */
unset_local_var(argv[1]);
return EXIT_SUCCESS;
}
@@ -2418,8 +2410,6 @@ static int expand_on_ifs(char **list, int n, char **posp, const char *str)
* to be filled). This routine is extremely tricky: has to deal with
* variables/parameters with whitespace, $* and $@, and constructs like
* 'echo -$*-'. If you play here, you must run testsuite afterwards! */
-/* NB: support for double-quoted expansion is not used yet (we never set
- * magic bit 0x80 elsewhere...) */
/* NB: another bug is that we cannot detect empty strings yet:
* "" or $empty"" expands to zero words, has to expand to empty word */
static int expand_vars_to_list(char **list, int n, char **posp, char *arg)
@@ -2663,20 +2653,6 @@ static char *insert_var_value(char *inp)
}
-
-
-
-
-
-
-
-
-
-
-
-
-
-
/* This is used to get/check local shell variables */
static const char *get_local_var(const char *s)
{
@@ -2717,7 +2693,7 @@ static int set_local_var(const char *s, int flg_export)
for (cur = top_vars; cur; cur = cur->next) {
if (strcmp(cur->name, name) == 0) {
if (strcmp(cur->value, value) == 0) {
- if (flg_export > 0 && cur->flg_export == 0)
+ if (flg_export && !cur->flg_export)
cur->flg_export = flg_export;
else
result++;
@@ -2730,8 +2706,8 @@ static int set_local_var(const char *s, int flg_export)
free((char*)cur->value);
cur->value = strdup(value);
}
+ goto skip;
}
- goto skip;
}
// TODO: need simpler/generic rollback on malloc failure - see ash