From 418543ed8d974b06b71694da5c71059eb45897b5 Mon Sep 17 00:00:00 2001
From: c
Date: Sat, 25 Nov 2023 22:52:11 -0500
Subject: Initial commit.

---
 .gitignore         |  2 ++
 Makefile           | 30 +++++++++++++++++++++++++
 README             |  9 ++++++++
 examples/hello.bf  |  1 +
 src/bf.c           | 38 +++++++++++++++++++++++++++++++
 src/include/bf.h   |  9 ++++++++
 src/include/util.h | 15 +++++++++++++
 src/util.c         | 65 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 8 files changed, 169 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Makefile
 create mode 100644 README
 create mode 100644 examples/hello.bf
 create mode 100644 src/bf.c
 create mode 100644 src/include/bf.h
 create mode 100644 src/include/util.h
 create mode 100644 src/util.c

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..17fbe89
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+*.o
+*.out
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..ec33c3c
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,30 @@
+name 				:= bf
+cc 				:= cc
+flags 			:= -g
+sources 			:= $(wildcard src/*.c)
+sources 			:= $(filter-out src/parser.c, $(sources)) # exclude the incomplete parser for now.
+objects 			:= $(sources:.c=.o)
+
+$(name): $(objects)
+	$(cc) $(objects) $(flags) -o ./$(name).out
+
+%.o: %.c include/%.h
+	$(cc) -c $(flags) $< -o $@
+
+install:
+	make
+	cp ./$(name).out /usr/local/bin/$(name)
+
+uninstall:
+	rm -f /usr/local/bin/$(name)
+
+clean:
+	rm -f ./$(name).out ./src/*.o
+
+me:
+	@[ "$(USER)" = "root" ] && echo "Okay." || echo "What? Make it yourself."
+
+a sandwich:
+	@exit
+
+.PHONY: install uninstall clean me a sandwich
diff --git a/README b/README
new file mode 100644
index 0000000..c7925b0
--- /dev/null
+++ b/README
@@ -0,0 +1,9 @@
+USAGE
+=====
+
+   $ bf <file> | gcc -x c -
+
+Example:
+
+   $ bf examples/hello.bf | gcc -o hello.out -x c -
+
diff --git a/examples/hello.bf b/examples/hello.bf
new file mode 100644
index 0000000..8fa0f72
--- /dev/null
+++ b/examples/hello.bf
@@ -0,0 +1 @@
+++++++++[>++++[>++>+++>+++>+<<<<-]>+>+>->>+[<]<-]>>.>---.+++++++..+++.>>.<-.<.+++.------.--------.>>+.>++.
diff --git a/src/bf.c b/src/bf.c
new file mode 100644
index 0000000..dec7aa3
--- /dev/null
+++ b/src/bf.c
@@ -0,0 +1,38 @@
+#include "include/util.h"
+#include "include/bf.h"
+
+void bf_run(char* src, FILE* out) {
+   fprintf(out, "#include <stdio.h>\n");
+   fprintf(out, "#include <stdlib.h>\n");
+
+   fprintf(out, "int main(){\n");
+   fprintf(out, "char b[30000];\n");   // create memory buffer
+   fprintf(out, "char*p=b;\n");        // create pointer
+
+   while (*src != '\0') {
+      switch (*src) {
+         case '>': fprintf(out, "p++;\n");         break;   // move pointer right
+         case '<': fprintf(out, "p--;\n");         break;   // move pointer left
+         case '+': fprintf(out, "++*p;\n");        break;   // increment cell
+         case '-': fprintf(out, "--*p;\n");        break;   // decrement cell
+         case '[': fprintf(out, "while(*p){\n");   break;   // begin loop
+         case ']': fprintf(out, "}\n");            break;   // end loop
+         case '.': fprintf(out, "putchar(*p);\n"); break;   // print cell
+         case ',': fprintf(out, "*p=getchar();\n");break;   // set cell from stdin
+         // ignore all other chars
+      }
+      src++;
+   }
+
+   fprintf(out, "exit(0);\nreturn 0;\n}\n");
+}
+
+int main(int argc, char** argv) {
+   char* src = (argc - 1)?
+      util_src_from_fpath(fopen(argv[1], "rb")):
+      util_src_from_stdin();
+
+   bf_run(src, stdout);
+   free(src);
+   return 0;
+}
diff --git a/src/include/bf.h b/src/include/bf.h
new file mode 100644
index 0000000..611f685
--- /dev/null
+++ b/src/include/bf.h
@@ -0,0 +1,9 @@
+#ifndef BF_H
+#define BF_H
+
+#include <stdlib.h>
+#include <stdio.h>
+
+void bf_run(char* src, FILE* out);
+
+#endif
diff --git a/src/include/util.h b/src/include/util.h
new file mode 100644
index 0000000..4a41ec6
--- /dev/null
+++ b/src/include/util.h
@@ -0,0 +1,15 @@
+#ifndef UTIL_H
+#define UTIL_H
+
+#include <stdlib.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <string.h>
+
+void util_die(const char* fmt, ...);   // print msg and exit
+void util_log(const char* fmt, ...);   // print msg
+char* util_get_src(char* arg);         // parse argtuments
+char* util_src_from_stdin();           // get source from stdin
+char* util_src_from_fpath(FILE* f);    // get source from file path
+
+#endif
diff --git a/src/util.c b/src/util.c
new file mode 100644
index 0000000..b36558b
--- /dev/null
+++ b/src/util.c
@@ -0,0 +1,65 @@
+#include "include/util.h"
+
+void util_die(const char* fmt, ...) {
+   va_list ap;
+   fprintf(stderr, "[\e[31m==\e[0m] ");
+   va_start(ap, fmt);
+   vfprintf(stderr, fmt, ap);
+   va_end(ap);
+   fprintf(stderr, "\n");
+   exit(1);
+}
+
+void util_log(const char* fmt, ...) {
+   va_list ap;
+   fprintf(stderr, "[\e[36m===\e[0m] ");
+   va_start(ap, fmt);
+   vfprintf(stderr, fmt, ap);
+   va_end(ap);
+   fprintf(stderr, "\n");
+}
+
+char* util_get_src(char* arg) {
+   if (arg) {
+      FILE* f = fopen(arg, "rb");
+      return util_src_from_fpath(f);
+   } else {
+      return util_src_from_stdin();
+   }
+}
+
+char* util_src_from_stdin() {
+   size_t  len = 0;
+   char* src = calloc(len, sizeof(char));
+
+   while (src[len - 1] != '%') {
+      char c = getchar();
+      src = realloc(src, (len + sizeof(char)));
+      memcpy(src + len, &c, sizeof(char));
+      len += sizeof(char);
+   }
+
+   src[len - 1] = '\0'; // drop the last '%' char
+
+   return src;
+}
+
+char* util_src_from_fpath(FILE* f) {
+   if (!f) {
+      util_die("source file not found");
+   }
+
+   fseek(f, 0L, SEEK_END);
+   long fsize = ftell(f);
+   rewind(f);
+
+   char* src = calloc(1, fsize + 1);
+
+   if ((fread(src, fsize, 1, f) != 1) || !src) {
+      fclose(f);
+      free(src);
+      util_die("could not read source file");
+   }
+
+   return src;
+}
-- 
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