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Much documentation; use BUFSIZ for buf length
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@ -1,31 +1,39 @@
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#include <criterion/criterion.h>
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#include <criterion/redirect.h>
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#include <unistd.h>
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#include "mos6502.dis.h"
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#include "mos6502.enums.h"
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#define TMPFILE "/dev/null"
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/*
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* BUFSIZ is the normal block-buffer size that a FILE stream would use
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* (possibly amongst other things).
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*/
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static char buf[BUFSIZ];
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static char buf[256];
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/*
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* This is the file stream we will be using to write our disassembly
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* code into.
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*/
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static FILE *stream = NULL;
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static FILE *input = NULL;
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static void
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setup()
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{
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stream = fopen(TMPFILE, "w");
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// Ok, so...there's some...trickery going on here. As you might
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// guess by the file path being /dev/null.
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stream = fopen("/dev/null", "w");
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if (stream == NULL) {
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perror("Could not open temporary file for mos6502 disassembly tests");
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}
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setvbuf(stream, buf, _IOFBF, 256);
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input = fopen(TMPFILE, "r");
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if (input == NULL) {
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perror("Could not open temporary file for mos6502 disassembly tests");
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}
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// The C standard library allows us to set an arbitrary buffer for a
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// file stream. It also allows us to fully buffer the file stream,
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// which means nothing is written to file until an fflush() or an
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// fclose() is called (or something else I can't think of). So we
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// can use the FILE abstraction to write our disassembly results
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// into, but use an underlying string buffer that we can easily
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// check with Criterion. Uh, unless we blow out the buffer size...
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// don't do that :D
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setvbuf(stream, buf, _IOFBF, 256);
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}
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@ -38,9 +46,20 @@ teardown()
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static void
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assert_buf(const char *str)
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{
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// This will set the cursor position in the file back to the start
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// of the file stream.
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rewind(stream);
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// Our actual assertion. The downside to doing it this way is that
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// when Criterion flags an assertion failure, it'll highlight _this_
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// line in the file, not in the test. It might be worth macroifying
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// this code.
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cr_assert_str_eq(buf, str);
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memset(buf, 0, sizeof(buf));
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// We're not sure what previous tests may have run, and where NUL
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// characters were set therein, so to be safe we wipe out the full
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// contents of the test buffer after every test.
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memset(buf, 0, BUFSIZ);
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}
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TestSuite(mos6502_dis, .init = setup, .fini = teardown);
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