59 lines
2.2 KiB
C
59 lines
2.2 KiB
C
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#include "akerror.h"
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#include "err_capture.h"
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#include <string.h>
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/*
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* __akerr_copy_string() is the only place in the library that writes through a
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* caller-supplied pointer for a caller-supplied length, so it validates every
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* argument and raises rather than returning quietly. Both in-library callers
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* check their arguments before calling it, so this test is what drives those
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* guards -- without it they are unreachable code that no build ever exercises.
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*/
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int main(void)
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{
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char buf[8];
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akerr_capture_install();
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akerr_init();
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/* The happy path: bounded, and always terminated. */
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memset(buf, 'x', sizeof(buf));
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AKERR_CHECK_SUCCEEDS(__akerr_copy_string(buf, (int)sizeof(buf), "abc"));
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AKERR_CHECK(strcmp(buf, "abc") == 0);
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/* A source longer than the buffer is truncated, never overrun. */
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memset(buf, 'x', sizeof(buf));
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AKERR_CHECK_SUCCEEDS(__akerr_copy_string(buf, (int)sizeof(buf), "abcdefghijkl"));
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AKERR_CHECK(strlen(buf) == sizeof(buf) - 1);
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AKERR_CHECK(buf[sizeof(buf) - 1] == '\0');
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AKERR_CHECK(strcmp(buf, "abcdefg") == 0);
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/* A capacity of exactly one holds nothing but the terminator. */
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memset(buf, 'x', sizeof(buf));
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AKERR_CHECK_SUCCEEDS(__akerr_copy_string(buf, 1, "abc"));
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AKERR_CHECK(buf[0] == '\0');
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AKERR_CHECK(buf[1] == 'x'); /* and wrote nothing past its capacity */
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/* NULL pointers raise instead of faulting, and the message says which. */
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AKERR_CHECK_RAISES(__akerr_copy_string(NULL, (int)sizeof(buf), "abc"),
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AKERR_NULLPOINTER);
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AKERR_CHECK_MESSAGE_CONTAINS("destination");
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AKERR_CHECK_RAISES(__akerr_copy_string(buf, (int)sizeof(buf), NULL),
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AKERR_NULLPOINTER);
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AKERR_CHECK_MESSAGE_CONTAINS("source");
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/* A capacity with no room for a terminator is a value error, not a write. */
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memset(buf, 'x', sizeof(buf));
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AKERR_CHECK_RAISES(__akerr_copy_string(buf, 0, "abc"), AKERR_VALUE);
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AKERR_CHECK_MESSAGE_CONTAINS("capacity of 0");
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AKERR_CHECK_RAISES(__akerr_copy_string(buf, -1, "abc"), AKERR_VALUE);
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AKERR_CHECK(buf[0] == 'x'); /* nothing was written */
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/* Each refusal handed its context back to the pool. */
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AKERR_CHECK(akerr_slots_in_use() == 0);
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fprintf(stderr, "err_copy_string ok\n");
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return 0;
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}
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