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Restore sprintbuf(), add macro for string literals

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Hawciz pointed out that the previous commit modifies the public
interface of printbuf. Per his suggestion, sprintbuf() was restored
and a new pair of macros was added that wraps printbuf_memappend().

Using a wrapper macro instead of modifying sprintbuf() also reduces
function call overhead, bringing total performance gains to
approximately 400%.
This commit is contained in:
Quentin Young
2017-02-03 21:43:59 +00:00
parent 9ff0f4987f
commit f6f852fd93
5 changed files with 157 additions and 43 deletions
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47
tests/test_printbuf.c
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@@ -17,7 +17,7 @@ static void test_basic_printbuf_memset()
printf("%s: starting test\n", __func__);
pb = printbuf_new();
sprintbuf(pb, "blue:1");
sprintbuf(pb, "blue:%d", 1);
printbuf_memset(pb, -1, 'x', 52);
printf("Buffer contents:%.*s\n", printbuf_length(pb), pb->buf);
printbuf_free(pb);
@@ -106,6 +106,49 @@ static void test_printbuf_memappend(int *before_resize)
printf("Append to just after resize: %d, [%s]\n", printbuf_length(pb), pb->buf);
free(data);
printbuf_free(pb);
#define SA_TEST_STR "XXXXXXXXXXXXXXXX"
pb = printbuf_new();
printbuf_strappend(pb, SA_TEST_STR);
printf("Buffer size after printbuf_strappend(): %d, [%s]\n", printbuf_length(pb), pb->buf);
printbuf_free(pb);
#undef SA_TEST_STR
printf("%s: end test\n", __func__);
}
static void test_sprintbuf(int before_resize);
static void test_sprintbuf(int before_resize)
{
struct printbuf *pb;
printf("%s: starting test\n", __func__);
pb = printbuf_new();
printf("Buffer length: %d\n", printbuf_length(pb));
char *data = malloc(before_resize + 1 + 1);
memset(data, 'X', before_resize + 1 + 1);
data[before_resize + 1] = '\0';
sprintbuf(pb, "%s", data);
free(data);
printf("sprintbuf to just after resize(%d+1): %d, [%s], strlen(buf)=%d\n", before_resize, printbuf_length(pb), pb->buf, (int)strlen(pb->buf));
printbuf_reset(pb);
sprintbuf(pb, "plain");
printf("%d, [%s]\n", printbuf_length(pb), pb->buf);
sprintbuf(pb, "%d", 1);
printf("%d, [%s]\n", printbuf_length(pb), pb->buf);
sprintbuf(pb, "%d", INT_MAX);
printf("%d, [%s]\n", printbuf_length(pb), pb->buf);
sprintbuf(pb, "%d", INT_MIN);
printf("%d, [%s]\n", printbuf_length(pb), pb->buf);
sprintbuf(pb, "%s", "%s");
printf("%d, [%s]\n", printbuf_length(pb), pb->buf);
printbuf_free(pb);
printf("%s: end test\n", __func__);
@@ -123,6 +166,8 @@ int main(int argc, char **argv)
printf("========================================\n");
test_printbuf_memappend(&before_resize);
printf("========================================\n");
test_sprintbuf(before_resize);
printf("========================================\n");
return 0;
}