mirror of
https://github.com/json-c/json-c.git
synced 2026-09-07 08:36:50 +08:00
Darren Carreras
62bb838c57
When the appended data points into the printbuf itself, growing the buffer may invalidate the source pointer before it is copied. Preserve the source offset across realloc and use memmove for internal overlap.
224 lines
6.1 KiB
C
224 lines
6.1 KiB
C
#ifdef NDEBUG
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#undef NDEBUG
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#endif
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#include <assert.h>
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#include <limits.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "debug.h"
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#include "printbuf.h"
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static void test_basic_printbuf_memset(void);
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static void test_printbuf_memset_length(void);
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#ifndef __func__
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/* VC++ compat */
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#define __func__ __FUNCTION__
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#endif
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static void test_basic_printbuf_memset(void)
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{
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struct printbuf *pb;
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printf("%s: starting test\n", __func__);
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pb = printbuf_new();
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sprintbuf(pb, "blue:%d", 1);
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printbuf_memset(pb, -1, 'x', 52);
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printf("Buffer contents:%.*s\n", printbuf_length(pb), pb->buf);
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printbuf_free(pb);
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printf("%s: end test\n", __func__);
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}
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static void test_printbuf_memset_length(void)
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{
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struct printbuf *pb;
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printf("%s: starting test\n", __func__);
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pb = printbuf_new();
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printbuf_memset(pb, -1, ' ', 0);
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printbuf_memset(pb, -1, ' ', 0);
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printbuf_memset(pb, -1, ' ', 0);
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printbuf_memset(pb, -1, ' ', 0);
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printbuf_memset(pb, -1, ' ', 0);
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printf("Buffer length: %d\n", printbuf_length(pb));
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printbuf_memset(pb, -1, ' ', 2);
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printbuf_memset(pb, -1, ' ', 4);
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printbuf_memset(pb, -1, ' ', 6);
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printf("Buffer length: %d\n", printbuf_length(pb));
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printbuf_memset(pb, -1, ' ', 6);
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printf("Buffer length: %d\n", printbuf_length(pb));
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printbuf_memset(pb, -1, ' ', 8);
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printbuf_memset(pb, -1, ' ', 10);
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printbuf_memset(pb, -1, ' ', 10);
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printbuf_memset(pb, -1, ' ', 10);
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printbuf_memset(pb, -1, ' ', 20);
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printf("Buffer length: %d\n", printbuf_length(pb));
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// No length change should occur
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printbuf_memset(pb, 0, 'x', 30);
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printf("Buffer length: %d\n", printbuf_length(pb));
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// This should extend it by one.
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printbuf_memset(pb, 0, 'x', printbuf_length(pb) + 1);
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printf("Buffer length: %d\n", printbuf_length(pb));
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printbuf_free(pb);
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printf("%s: end test\n", __func__);
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}
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static void test_printbuf_memappend(int *before_resize);
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static void test_printbuf_memappend(int *before_resize)
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{
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struct printbuf *pb;
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int initial_size;
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printf("%s: starting test\n", __func__);
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pb = printbuf_new();
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printf("Buffer length: %d\n", printbuf_length(pb));
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initial_size = pb->size;
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while (pb->size == initial_size)
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{
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printbuf_memappend_fast(pb, "x", 1);
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}
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*before_resize = printbuf_length(pb) - 1;
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printf("Appended %d bytes for resize: [%s]\n", *before_resize + 1, pb->buf);
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printbuf_reset(pb);
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printbuf_memappend_fast(pb, "bluexyz123", 3);
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printf("Partial append: %d, [%s]\n", printbuf_length(pb), pb->buf);
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char with_nulls[] = {'a', 'b', '\0', 'c'};
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printbuf_reset(pb);
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printbuf_memappend_fast(pb, with_nulls, (int)sizeof(with_nulls));
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printf("With embedded \\0 character: %d, [%s]\n", printbuf_length(pb), pb->buf);
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printbuf_free(pb);
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pb = printbuf_new();
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char *data = malloc(*before_resize);
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memset(data, 'X', *before_resize);
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printbuf_memappend_fast(pb, data, *before_resize);
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printf("Append to just before resize: %d, [%s]\n", printbuf_length(pb), pb->buf);
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free(data);
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printbuf_free(pb);
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pb = printbuf_new();
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data = malloc(*before_resize + 1);
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memset(data, 'X', *before_resize + 1);
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printbuf_memappend_fast(pb, data, *before_resize + 1);
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printf("Append to just after resize: %d, [%s]\n", printbuf_length(pb), pb->buf);
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free(data);
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printbuf_free(pb);
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#define SA_TEST_STR "XXXXXXXXXXXXXXXX"
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pb = printbuf_new();
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printbuf_strappend(pb, SA_TEST_STR);
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printf("Buffer size after printbuf_strappend(): %d, [%s]\n", printbuf_length(pb), pb->buf);
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printbuf_free(pb);
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#undef SA_TEST_STR
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printf("%s: end test\n", __func__);
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}
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static void test_printbuf_self_append(void);
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static void test_printbuf_self_append(void)
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{
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struct printbuf *pb;
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char *data;
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int data_size;
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int i;
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int initial_size;
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printf("%s: starting test\n", __func__);
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pb = printbuf_new();
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assert(pb != NULL);
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initial_size = pb->size;
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data_size = initial_size / 2 + 1;
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data = malloc(data_size);
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assert(data != NULL);
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memset(data, 'X', data_size);
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assert(printbuf_memappend(pb, data, data_size) == data_size);
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free(data);
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assert(pb->size == initial_size);
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assert(printbuf_memappend(pb, pb->buf, pb->bpos) == data_size);
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assert(pb->size > initial_size);
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assert(pb->bpos == data_size * 2);
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for (i = 0; i < pb->bpos; i++)
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assert(pb->buf[i] == 'X');
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assert(pb->buf[pb->bpos] == '\0');
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printbuf_free(pb);
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printf("%s: end test\n", __func__);
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}
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static void test_sprintbuf(int before_resize);
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static void test_sprintbuf(int before_resize)
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{
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struct printbuf *pb;
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const char *max_char =
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"if string is greater than stack buffer, then use dynamic string"
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" with vasprintf. Note: some implementation of vsnprintf return -1 "
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" if output is truncated whereas some return the number of bytes that "
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" would have been written - this code handles both cases.";
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printf("%s: starting test\n", __func__);
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pb = printbuf_new();
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printf("Buffer length: %d\n", printbuf_length(pb));
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char *data = malloc(before_resize + 1 + 1);
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memset(data, 'X', before_resize + 1 + 1);
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data[before_resize + 1] = '\0';
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sprintbuf(pb, "%s", data);
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free(data);
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printf("sprintbuf to just after resize(%d+1): %d, [%s], strlen(buf)=%d\n", before_resize,
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printbuf_length(pb), pb->buf, (int)strlen(pb->buf));
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printbuf_reset(pb);
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sprintbuf(pb, "plain");
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printf("%d, [%s]\n", printbuf_length(pb), pb->buf);
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sprintbuf(pb, "%d", 1);
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printf("%d, [%s]\n", printbuf_length(pb), pb->buf);
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sprintbuf(pb, "%d", INT_MAX);
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printf("%d, [%s]\n", printbuf_length(pb), pb->buf);
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sprintbuf(pb, "%d", INT_MIN);
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printf("%d, [%s]\n", printbuf_length(pb), pb->buf);
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sprintbuf(pb, "%s", "%s");
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printf("%d, [%s]\n", printbuf_length(pb), pb->buf);
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sprintbuf(pb, max_char);
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printf("%d, [%s]\n", printbuf_length(pb), pb->buf);
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printbuf_free(pb);
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printf("%s: end test\n", __func__);
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}
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int main(int argc, char **argv)
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{
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int before_resize = 0;
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MC_SET_DEBUG(1);
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test_basic_printbuf_memset();
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printf("========================================\n");
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test_printbuf_memset_length();
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printf("========================================\n");
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test_printbuf_memappend(&before_resize);
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printf("========================================\n");
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test_printbuf_self_append();
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printf("========================================\n");
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test_sprintbuf(before_resize);
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printf("========================================\n");
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return 0;
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}
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