From fb745e80e321018ca0b5b5dc80d25b9f6145481e Mon Sep 17 00:00:00 2001
From: Pietro Gagliardi <pietro10@mac.com>
Date: Mon, 21 May 2018 22:42:19 -0400
Subject: [PATCH] Started the tool to convert Windows API functions into
 HRESULT wrappers.

---
 windows/tools/hresultwrap.cpp | 158 ++++++++++++++++++++++++++++++++++
 1 file changed, 158 insertions(+)
 create mode 100644 windows/tools/hresultwrap.cpp

diff --git a/windows/tools/hresultwrap.cpp b/windows/tools/hresultwrap.cpp
new file mode 100644
index 00000000..05388837
--- /dev/null
+++ b/windows/tools/hresultwrap.cpp
@@ -0,0 +1,158 @@
+// 21 may 2018
+#include <vector>
+#include <stdio.h>
+#include <string.h>
+
+#define nbuf 1024
+
+bool generate(std::vector<char> *genline, FILE *fout)
+{
+	std::vector<char> genout(nbuf);
+	size_t nw;
+
+	genout.push_back('/');
+	genout.push_back('/');
+	genout.push_back(' ');
+	genout.insert(genout.end(), genline->begin(), genline->end());
+	genout.push_back('\n');
+
+	genout.push_back('\n');
+	nw = fwrite(genout.data(), sizeof (char), genout.size(), fout);
+	return nw != genout.size();
+}
+
+struct process {
+	// each of these returns the number of bytes in buf that were processed
+	size_t (*state)(struct process *p, const char *buf, size_t n, FILE *fout);
+	bool error;
+	std::vector<char> *genline;
+};
+
+static size_t stateError(struct process *p, const char *buf, size_t n, FILE *fout)
+{
+	p->error = true;
+	return n;
+}
+
+size_t stateCopyLine(struct process *p, const char *buf, size_t n, FILE *fout);
+size_t stateGenerate(struct process *p, const char *buf, size_t n, FILE *fout);
+
+size_t stateNewLine(struct process *p, const char *buf, size_t n, FILE *fout)
+{
+	if (n > 0 && buf[0] == '@') {
+		p->state = stateGenerate;
+		return 1;		// skip the @
+	}
+	p->state = stateCopyLine;
+	return 0;			// don't skip anything
+}
+
+size_t stateCopyLine(struct process *p, const char *buf, size_t n, FILE *fout)
+{
+	size_t nw;
+	size_t j;
+
+	for (j = 0; j < n; j++)
+		if (buf[j] == '\n') {
+			// include the newline; that's being copied too
+			j++;
+			break;
+		}
+	nw = fwrite(buf, sizeof (char), j, fout);
+	if (nw != j) {
+		p->state = stateError;
+		return 0;
+	}
+	// and on to the next line
+	p->state = stateNewLine;
+	return j;
+}
+
+size_t stateGenerate(struct process *p, const char *buf, size_t n, FILE *fout)
+{
+	size_t j;
+
+	if (p->genline == NULL)
+		p->genline = new std::vector<size_t>(n);
+	for (j = 0; j < n; j++)
+		if (buf[j] == '\n')
+			// do NOT include the newline this time
+			break;
+	p->genline->insert(p->genline->end(), buf, buf + j);
+	if (j == n)		// '\n' not found; not finished with the line yet
+		return j;
+	// finished with the line; process it and continue
+	p->state = stateNewLine;
+	if (!generate(p->genline, fout))
+		p->state = stateError;
+	delete p->genline;
+	p->genline = NULL;
+	// buf[j] == '\n' and generate() took care of printing a newline
+	return j + 1;
+}
+
+void processInit(struct process *p)
+{
+	memset(p, 0, sizeof (struct process));
+	p->state = stateNewLine;
+}
+
+bool process(struct process *p, const char *buf, size_t n, FILE *fout)
+{
+	size_t np;
+
+	while (n != 0) {
+		np = (*(p->state))(p, buf, n, fout);
+		buf += np;
+		n -= np;
+	}
+	return p->error;
+}
+
+int main(int argc, char *argv[])
+{
+	FILE *fin = NULL, *fout = NULL;
+	char buf[nbuf];
+	size_t n;
+	struct process p;
+	int ret = 1;
+
+	if (argc != 3) {
+		fprintf(stderr, "usage: %s infile outfile\n", argv[0]);
+		return 1;
+	}
+
+	fin = fopen(argv[1], "rb");
+	if (fin == NULL) {
+		fprintf(stderr, "error opening %s\n", argv[1]);
+		goto done;
+	}
+	fout = fopen(argv[2], "wb");
+	if (fout == NULL) {
+		fprintf(stderr, "error creating %s\n", argv[2]);
+		goto done;
+	}
+
+	processInit(&p);
+	for (;;) {
+		n = fread(buf, sizeof (char), nbuf, fin);
+		if (n == 0)
+			break;
+		if (!process(&p, buf, n, fout)) {
+			fprintf(stderr, "error writing to %s\n", argv[2]);
+			goto done;
+		}
+	}
+	if (!feof(fin)) {
+		fprintf(stderr, "error reading from %s\n", argv[1]);
+		goto done;
+	}
+
+	ret = 0;
+done:
+	if (fin != NULL)
+		fclose(fin);
+	if (fout != NULL)
+		fclose(fout);
+	return ret;
+}