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allow regexp interruption (e.g. with Ctrl-C in the REPL)

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This commit is contained in:
Fabrice Bellard
2025-03-13 17:17:51 +01:00
parent 027f3cb5e4
commit 25aaa77370
3 changed files with 61 additions and 12 deletions
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36
libregexp.c
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@@ -54,6 +54,9 @@ typedef enum {
#define CAPTURE_COUNT_MAX 255
#define STACK_SIZE_MAX 255
/* must be large enough to have a negligible runtime cost and small
enough to call the interrupt callback often. */
#define INTERRUPT_COUNTER_INIT 10000
/* unicode code points */
#define CP_LS 0x2028
@@ -1931,6 +1934,7 @@ typedef struct {
BOOL multi_line;
BOOL ignore_case;
BOOL is_unicode;
int interrupt_counter;
void *opaque; /* used for stack overflow check */
size_t state_size;
@@ -1977,7 +1981,17 @@ static int push_state(REExecContext *s,
return 0;
}
/* return 1 if match, 0 if not match or -1 if error. */
static int lre_poll_timeout(REExecContext *s)
{
if (unlikely(--s->interrupt_counter <= 0)) {
s->interrupt_counter = INTERRUPT_COUNTER_INIT;
if (lre_check_timeout(s->opaque))
return LRE_RET_TIMEOUT;
}
return 0;
}
/* return 1 if match, 0 if not match or < 0 if error. */
static intptr_t lre_exec_backtrack(REExecContext *s, uint8_t **capture,
StackInt *stack, int stack_len,
const uint8_t *pc, const uint8_t *cptr,
@@ -2008,6 +2022,8 @@ static intptr_t lre_exec_backtrack(REExecContext *s, uint8_t **capture,
ret = 0;
recurse:
for(;;) {
if (lre_poll_timeout(s))
return LRE_RET_TIMEOUT;
if (s->state_stack_len == 0)
return ret;
rs = (REExecState *)(s->state_stack +
@@ -2097,7 +2113,7 @@ static intptr_t lre_exec_backtrack(REExecContext *s, uint8_t **capture,
ret = push_state(s, capture, stack, stack_len,
pc1, cptr, RE_EXEC_STATE_SPLIT, 0);
if (ret < 0)
return -1;
return LRE_RET_MEMORY_ERROR;
break;
}
case REOP_lookahead:
@@ -2109,12 +2125,14 @@ static intptr_t lre_exec_backtrack(REExecContext *s, uint8_t **capture,
RE_EXEC_STATE_LOOKAHEAD + opcode - REOP_lookahead,
0);
if (ret < 0)
return -1;
return LRE_RET_MEMORY_ERROR;
break;
case REOP_goto:
val = get_u32(pc);
pc += 4 + (int)val;
if (lre_poll_timeout(s))
return LRE_RET_TIMEOUT;
break;
case REOP_line_start:
if (cptr == s->cbuf)
@@ -2179,6 +2197,8 @@ static intptr_t lre_exec_backtrack(REExecContext *s, uint8_t **capture,
pc += 4;
if (--stack[stack_len - 1] != 0) {
pc += (int)val;
if (lre_poll_timeout(s))
return LRE_RET_TIMEOUT;
}
break;
case REOP_push_char_pos:
@@ -2353,9 +2373,12 @@ static intptr_t lre_exec_backtrack(REExecContext *s, uint8_t **capture,
q = 0;
for(;;) {
if (lre_poll_timeout(s))
return LRE_RET_TIMEOUT;
res = lre_exec_backtrack(s, capture, stack, stack_len,
pc1, cptr, TRUE);
if (res == -1)
if (res == LRE_RET_MEMORY_ERROR ||
res == LRE_RET_TIMEOUT)
return res;
if (!res)
break;
@@ -2373,7 +2396,7 @@ static intptr_t lre_exec_backtrack(REExecContext *s, uint8_t **capture,
RE_EXEC_STATE_GREEDY_QUANT,
q - quant_min);
if (ret < 0)
return -1;
return LRE_RET_MEMORY_ERROR;
}
}
break;
@@ -2383,7 +2406,7 @@ static intptr_t lre_exec_backtrack(REExecContext *s, uint8_t **capture,
}
}
/* Return 1 if match, 0 if not match or -1 if error. cindex is the
/* Return 1 if match, 0 if not match or < 0 if error (see LRE_RET_x). cindex is the
starting position of the match and must be such as 0 <= cindex <=
clen. */
int lre_exec(uint8_t **capture,
@@ -2405,6 +2428,7 @@ int lre_exec(uint8_t **capture,
s->cbuf_type = cbuf_type;
if (s->cbuf_type == 1 && s->is_unicode)
s->cbuf_type = 2;
s->interrupt_counter = INTERRUPT_COUNTER_INIT;
s->opaque = opaque;
s->state_size = sizeof(REExecState) +