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-rw-r--r--shell/hush.c129
1 files changed, 70 insertions, 59 deletions
diff --git a/shell/hush.c b/shell/hush.c
index 8ffb117..32cd65c 100644
--- a/shell/hush.c
+++ b/shell/hush.c
@@ -317,8 +317,10 @@ typedef struct {
/* I can almost use ordinary FILE *. Is open_memstream() universally
* available? Where is it documented? */
struct in_str {
- const char *p;
- char peek_buf[2];
+ union {
+ const char *p;
+ int cached_ch;
+ };
#if ENABLE_HUSH_INTERACTIVE
int __promptme;
int promptmode;
@@ -1112,8 +1114,10 @@ static int file_get(struct in_str *i)
ch = 0;
/* If there is data waiting, eat it up */
- if (i->p && *i->p) {
- ch = *i->p++;
+ if (i->cached_ch) {
+ ch = i->cached_ch ^ 0x100;
+ if (ch != EOF)
+ i->cached_ch = 0;
} else {
/* need to double check i->file because we might be doing something
* more complicated by now, like sourcing or substituting. */
@@ -1133,7 +1137,7 @@ static int file_get(struct in_str *i)
{
ch = fgetc(i->file);
}
- debug_printf("b_getch: got a %d\n", ch);
+ debug_printf("file_get: got a %d\n", ch);
}
#if ENABLE_HUSH_INTERACTIVE
if (ch == '\n')
@@ -1147,14 +1151,14 @@ static int file_get(struct in_str *i)
*/
static int file_peek(struct in_str *i)
{
- if (i->p && *i->p) {
- return *i->p;
+ int ch;
+ if (i->cached_ch) {
+ return i->cached_ch ^ 0x100;
}
- i->peek_buf[0] = fgetc(i->file);
- i->peek_buf[1] = '\0';
- i->p = i->peek_buf;
- debug_printf("b_peek: got a %d\n", *i->p);
- return *i->p;
+ ch = fgetc(i->file);
+ i->cached_ch = ch ^ 0x100; /* ^ 0x100 so that it is never 0 */
+ debug_printf("file_peek: got a %d '%c'\n", ch, ch);
+ return ch;
}
static void setup_file_in_str(struct in_str *i, FILE *f)
@@ -1670,10 +1674,10 @@ static int run_pipe_real(struct pipe *pi)
int export_me = 0;
char *name, *value;
name = xstrdup(argv[i]);
- debug_printf("Local environment set: %s\n", name);
+ debug_printf("local environment set: %s\n", name);
value = strchr(name, '=');
if (value)
- *value = 0;
+ *value = '\0';
if (get_local_var(name)) {
export_me = 1;
}
@@ -2364,9 +2368,10 @@ static const char *get_local_var(const char *s)
if (!s)
return NULL;
- for (cur = top_vars; cur; cur = cur->next)
+ for (cur = top_vars; cur; cur = cur->next) {
if (strcmp(cur->name, s) == 0)
return cur->value;
+ }
return NULL;
}
@@ -2380,7 +2385,7 @@ static int set_local_var(const char *s, int flg_export)
int result = 0;
struct variables *cur;
- name = strdup(s);
+ name = xstrdup(s);
/* Assume when we enter this function that we are already in
* NAME=VALUE format. So the first order of business is to
@@ -2394,48 +2399,46 @@ static int set_local_var(const char *s, int flg_export)
*value++ = '\0';
for (cur = top_vars; cur; cur = cur->next) {
- if (strcmp(cur->name, name) == 0)
- break;
- }
-
- if (cur) {
- if (strcmp(cur->value, value) == 0) {
- if (flg_export > 0 && cur->flg_export == 0)
- cur->flg_export = flg_export;
- else
- result++;
- } else if (cur->flg_read_only) {
- bb_error_msg("%s: readonly variable", name);
- result = -1;
- } else {
- if (flg_export > 0 || cur->flg_export > 1)
- cur->flg_export = 1;
- free((char*)cur->value);
-
- cur->value = strdup(value);
- }
- } else {
- cur = malloc(sizeof(struct variables));
- if (!cur) {
- result = -1;
- } else {
- cur->name = strdup(name);
- if (!cur->name) {
- free(cur);
+ if (strcmp(cur->name, name) == 0) {
+ if (strcmp(cur->value, value) == 0) {
+ if (flg_export > 0 && cur->flg_export == 0)
+ cur->flg_export = flg_export;
+ else
+ result++;
+ } else if (cur->flg_read_only) {
+ bb_error_msg("%s: readonly variable", name);
result = -1;
} else {
- struct variables *bottom = top_vars;
+ if (flg_export > 0 || cur->flg_export > 1)
+ cur->flg_export = 1;
+ free((char*)cur->value);
cur->value = strdup(value);
- cur->next = 0;
- cur->flg_export = flg_export;
- cur->flg_read_only = 0;
- while (bottom->next)
- bottom = bottom->next;
- bottom->next = cur;
}
}
+ goto skip;
}
+// TODO: need simpler/generic rollback on malloc failure - see ash
+ cur = malloc(sizeof(*cur));
+ if (!cur) {
+ result = -1;
+ } else {
+ cur->name = strdup(name);
+ if (!cur->name) {
+ free(cur);
+ result = -1;
+ } else {
+ struct variables *bottom = top_vars;
+ cur->value = strdup(value);
+ cur->next = 0;
+ cur->flg_export = flg_export;
+ cur->flg_read_only = 0;
+ while (bottom->next)
+ bottom = bottom->next;
+ bottom->next = cur;
+ }
+ }
+ skip:
if (result == 0 && cur->flg_export == 1) {
*(value-1) = '=';
result = putenv(name);
@@ -2975,11 +2978,16 @@ static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *i
int i, advance = 0;
char sep[] = " ";
int ch = input->peek(input); /* first character after the $ */
- debug_printf("handle_dollar: ch=%c\n", ch);
+
+ debug_printf_parse("handle_dollar entered: ch='%c'\n", ch);
if (isalpha(ch)) {
b_addchr(dest, SPECIAL_VAR_SYMBOL);
ctx->child->sp++;
- while (ch = b_peek(input), isalnum(ch) || ch == '_') {
+ while (1) {
+ ch = b_peek(input);
+ if (!isalnum(ch) && ch != '_')
+ break;
+ debug_printf_parse(": '%c'\n", ch);
b_getch(input);
b_addchr(dest, ch);
}
@@ -3014,14 +3022,16 @@ static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *i
/* XXX maybe someone will try to escape the '}' */
while (1) {
ch = b_getch(input);
- if (ch == EOF || ch == '}')
+ if (ch == EOF) {
+ syntax();
+ debug_printf_parse("handle_dollar return 1: unterminated ${name}\n");
+ return 1;
+ }
+ if (ch == '}')
break;
+ debug_printf_parse(": '%c'\n", ch);
b_addchr(dest, ch);
}
- if (ch != '}') {
- syntax();
- return 1;
- }
b_addchr(dest, SPECIAL_VAR_SYMBOL);
break;
case '(':
@@ -3052,6 +3062,7 @@ static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *i
* a nice size-optimized program. Hah! That'll be the day.
*/
if (advance) b_getch(input);
+ debug_printf_parse("handle_dollar return 0\n");
return 0;
}
@@ -3079,7 +3090,7 @@ static int parse_stream(o_string *dest, struct p_context *ctx,
while ((ch = b_getch(input)) != EOF) {
m = map[ch];
- next = (ch == '\n') ? 0 : b_peek(input);
+ next = (ch == '\n') ? '\0' : b_peek(input);
debug_printf_parse(": ch=%c (%d) m=%d quote=%d\n",
ch, ch, m, dest->quote);
if (m == MAP_ORDINARY
generated by cgit v1.1 at 2024-11-02 18:15:03 +0000