initial commit

5 files changed, 91 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..b2a8745
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+restruct
+*.o
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..c4f2d14
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,32 @@
+CC      := gcc
+LD      := $(CC)
+SRC     := $(wildcard *.c)
+OBJ     := $(patsubst %.c,%.o,$(patsubst %.cpp,%.o,$(SRC)))
+NAME    := restruct
+CFLAGS  := -Wall -Wextra -std=c99 -pedantic
+LDFLAGS :=
+
+all: $(NAME)
+
+$(NAME): $(OBJ)
+	@printf '[ld]  *.o -> %s\n' "$(NAME)"
+	@$(LD) -o $(NAME) $(OBJ) $(LDFLAGS)
+
+%.o: %.c
+	@printf '[cc]  %s -> %s\n' "$<" "$@"
+	@$(CC) $(CFLAGS) -c -o $@ $<
+
+clean:
+	@printf '[rm]\n'
+	@rm -rf $(NAME) $(OBJ)
+
+run: $(NAME)
+	@printf '[run]\n'
+	@./$(NAME)
+
+re:
+	@printf '[re]\n'
+	@make --no-print-directory clean
+	@make --no-print-directory
+
+.PHONY: all clean run re
diff --git a/drain.c b/drain.c
new file mode 100644
index 0000000..40c049e
--- /dev/null
+++ b/drain.c
@@ -0,0 +1,28 @@
+#include "drain.h"
+#include <stdlib.h>
+#include <string.h>
+
+char *drain(FILE *fp)
+{
+	size_t size = 1025;
+	char *buf = calloc(1025, 1);
+	if (buf == NULL) {
+		perror("drain");
+		return NULL;
+	}
+	/* Read until end of file. */
+	for (;;) {
+		if (fread(buf + size - 1025, 1024, 1, fp) != 1)
+			return buf;
+		/* Line is longer than 1024 bytes, realloc to make space. */
+		size += 1024;
+		char *new_buf = realloc(buf, size);
+		if (new_buf == NULL) {
+			perror("drain");
+			free(buf);
+			return NULL;
+		}
+		buf = new_buf;
+		memset(buf + size - 1024, 0, 1024);
+	}
+}
diff --git a/drain.h b/drain.h
new file mode 100644
index 0000000..830261a
--- /dev/null
+++ b/drain.h
@@ -0,0 +1,4 @@
+#pragma once
+#include <stdio.h>
+
+char *drain(FILE *fp);
diff --git a/main.c b/main.c
new file mode 100644
index 0000000..2f334e9
--- /dev/null
+++ b/main.c
@@ -0,0 +1,25 @@
+#include "drain.h"
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(int argc, char **argv)
+{
+	if (argc != 2) {
+		fprintf(stderr, "usage: %s <file>\n", argv[0]);
+		return 1;
+	}
+	FILE *fp = fopen(argv[1], "rb");
+	if (fp == NULL) {
+		perror("main");
+		return 1;
+	}
+	char *data = drain(fp);
+	fclose(fp);
+	if (data == NULL) {
+		fprintf(stderr, "failed to drain '%s'\n", argv[1]);
+		return 1;
+	}
+	printf("%s", data);
+	free(data);
+	return 0;
+}