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The return value of SDL_snprintf is the number of characters that would have been written.

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Fixes https://github.com/libsdl-org/SDL/issues/4762
This commit is contained in:
Sam Lantinga 2021-09-22 11:42:10 -07:00
parent 9b74623be9
commit 79b0aae86c
2 changed files with 95 additions and 107 deletions
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18
test/testautomation_stdlib.c
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@ -44,6 +44,7 @@ int
stdlib_snprintf(void *arg)
{
int result;
int predicted;
char text[1024];
const char *expected;
@ -60,55 +61,72 @@ stdlib_snprintf(void *arg)
SDLTest_AssertCheck(result == 3, "Check result value, expected: 3, got: %d", result);
result = SDL_snprintf(NULL, 0, "%s", "foo");
SDLTest_AssertPass("Call to SDL_snprintf(NULL, 0, \"%%s\", \"foo\")");
SDLTest_AssertCheck(result == 3, "Check result value, expected: 3, got: %d", result);
result = SDL_snprintf(text, sizeof(text), "%f", 1.0);
predicted = SDL_snprintf(NULL, 0, "%f", 1.0);
expected = "1.000000";
SDLTest_AssertPass("Call to SDL_snprintf(\"%%f\", 1.0)");
SDLTest_AssertCheck(SDL_strcmp(text, expected) == 0, "Check text, expected: %s, got: %s", expected, text);
SDLTest_AssertCheck(result == SDL_strlen(text), "Check result value, expected: %d, got: %d", (int) SDL_strlen(text), result);
SDLTest_AssertCheck(predicted == result, "Check predicted value, expected: %d, got: %d", result, predicted);
result = SDL_snprintf(text, sizeof(text), "%.f", 1.0);
predicted = SDL_snprintf(NULL, 0, "%.f", 1.0);
expected = "1";
SDLTest_AssertPass("Call to SDL_snprintf(\"%%.f\", 1.0)");
SDLTest_AssertCheck(SDL_strcmp(text, expected) == 0, "Check text, expected: %s, got: %s", expected, text);
SDLTest_AssertCheck(result == SDL_strlen(text), "Check result value, expected: %d, got: %d", (int) SDL_strlen(text), result);
SDLTest_AssertCheck(predicted == result, "Check predicted value, expected: %d, got: %d", result, predicted);
result = SDL_snprintf(text, sizeof(text), "%#.f", 1.0);
predicted = SDL_snprintf(NULL, 0, "%#.f", 1.0);
expected = "1.";
SDLTest_AssertPass("Call to SDL_snprintf(\"%%#.f\", 1.0)");
SDLTest_AssertCheck(SDL_strcmp(text, expected) == 0, "Check text, expected: %s, got: %s", expected, text);
SDLTest_AssertCheck(result == SDL_strlen(text), "Check result value, expected: %d, got: %d", (int) SDL_strlen(text), result);
SDLTest_AssertCheck(predicted == result, "Check predicted value, expected: %d, got: %d", result, predicted);
result = SDL_snprintf(text, sizeof(text), "%f", 1.0 + 1.0 / 3.0);
predicted = SDL_snprintf(NULL, 0, "%f", 1.0 + 1.0 / 3.0);
expected = "1.333333";
SDLTest_AssertPass("Call to SDL_snprintf(\"%%f\", 1.0 + 1.0 / 3.0)");
SDLTest_AssertCheck(SDL_strcmp(text, expected) == 0, "Check text, expected: %s, got: %s", expected, text);
SDLTest_AssertCheck(result == SDL_strlen(text), "Check result value, expected: %d, got: %d", (int) SDL_strlen(text), result);
SDLTest_AssertCheck(predicted == result, "Check predicted value, expected: %d, got: %d", result, predicted);
result = SDL_snprintf(text, sizeof(text), "%+f", 1.0 + 1.0 / 3.0);
predicted = SDL_snprintf(NULL, 0, "%+f", 1.0 + 1.0 / 3.0);
expected = "+1.333333";
SDLTest_AssertPass("Call to SDL_snprintf(\"%%+f\", 1.0 + 1.0 / 3.0)");
SDLTest_AssertCheck(SDL_strcmp(text, expected) == 0, "Check text, expected: %s, got: %s", expected, text);
SDLTest_AssertCheck(result == SDL_strlen(text), "Check result value, expected: %d, got: %d", (int) SDL_strlen(text), result);
SDLTest_AssertCheck(predicted == result, "Check predicted value, expected: %d, got: %d", result, predicted);
result = SDL_snprintf(text, sizeof(text), "%.2f", 1.0 + 1.0 / 3.0);
predicted = SDL_snprintf(NULL, 0, "%.2f", 1.0 + 1.0 / 3.0);
expected = "1.33";
SDLTest_AssertPass("Call to SDL_snprintf(\"%%.2f\", 1.0 + 1.0 / 3.0)");
SDLTest_AssertCheck(SDL_strcmp(text, expected) == 0, "Check text, expected: %s, got: %s", expected, text);
SDLTest_AssertCheck(result == SDL_strlen(text), "Check result value, expected: %d, got: %d", (int) SDL_strlen(text), result);
SDLTest_AssertCheck(predicted == result, "Check predicted value, expected: %d, got: %d", result, predicted);
result = SDL_snprintf(text, sizeof(text), "%6.2f", 1.0 + 1.0 / 3.0);
predicted = SDL_snprintf(NULL, 0, "%6.2f", 1.0 + 1.0 / 3.0);
expected = " 1.33";
SDLTest_AssertPass("Call to SDL_snprintf(\"%%6.2f\", 1.0 + 1.0 / 3.0)");
SDLTest_AssertCheck(SDL_strcmp(text, expected) == 0, "Check text, expected: '%s', got: '%s'", expected, text);
SDLTest_AssertCheck(result == SDL_strlen(text), "Check result value, expected: %d, got: %d", (int) SDL_strlen(text), result);
SDLTest_AssertCheck(predicted == result, "Check predicted value, expected: %d, got: %d", result, predicted);
result = SDL_snprintf(text, sizeof(text), "%06.2f", 1.0 + 1.0 / 3.0);
predicted = SDL_snprintf(NULL, 0, "%06.2f", 1.0 + 1.0 / 3.0);
expected = "001.33";
SDLTest_AssertPass("Call to SDL_snprintf(\"%%06.2f\", 1.0 + 1.0 / 3.0)");
SDLTest_AssertCheck(SDL_strcmp(text, expected) == 0, "Check text, expected: '%s', got: '%s'", expected, text);
SDLTest_AssertCheck(result == SDL_strlen(text), "Check result value, expected: %d, got: %d", (int) SDL_strlen(text), result);
SDLTest_AssertCheck(predicted == result, "Check predicted value, expected: %d, got: %d", result, predicted);
result = SDL_snprintf(text, 5, "%06.2f", 1.0 + 1.0 / 3.0);
expected = "001.";