Initial commit: add very simple hexdump

.gitignore

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+*~

README.org

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+#+TITLE: hexutils - hexdump, xxd
+
+Simple tools to work with binary files and display them in ascii, hex or binary and make hexdumps

src/Makefile

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+CC = gcc
+CFLAGS= -Wall -Wextra
+LFLAGS=
+
+all: hexdump
+
+main: $(OBJFILES) 
+	$(CC) hexdump.c -o hexdump
+
+test: main
+	./hexdump

src/hexdump.c

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+#include <stdio.h>
+#include <string.h>
+
+int dumpgroup = 0; // To know where newline should be
+int hexnum = 1; // To put space after every second hex number
+
+int chardump(char *data, int end_of_line /* to display only 16 chars */) {
+	for (int i=0; i < end_of_line; i++) {
+		if (data[i] == "\0")
+			printf(".");
+		else 
+			printf("%c", data[i]);
+	}
+	printf("\n");
+	return 0;
+}
+
+
+int hexdump(char *data) {
+	//printf("%s\n", data); // FIXME
+	for (int i=0; i < strlen(data); i++) {
+		hexnum++;
+		if (data[i] == '\0') 
+			printf("00");
+		else
+			printf("%02x", data[i]);
+		if (hexnum%2) {
+			printf(" ");
+			dumpgroup++;
+		}
+		if (dumpgroup == 8) {
+			dumpgroup = 0;
+			printf("  ");
+			chardump(data, i);
+			//printf("\n");
+		}
+	}
+	//printf("\n"); // FIXME
+}
+
+int main() {
+	FILE *infile = fopen("../tests/test.bin", "r");//fopen("test.bin", "r");
+	char data[50];
+	while (fgets(data, 50, infile) != NULL) {
+		hexdump(data);
+	}
+	printf("\n"); // FIXME
+	fclose(infile);
+}