Public release

.github/FUNDING.yml

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+# These are supported funding model platforms
+
+github: p0dalirius
+patreon: Podalirius

Makefile

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+.PHONY:clean compile
+
+OUTBINARY := hexcat
+
+CC := gcc
+CCFLAGS := -Wall
+
+all : clean compile
+
+compile :
+ @if [ ! -d "bin/" ]; then mkdir -p "bin/"; fi;
+ $(CC) $(CCFLAGS) "src/hexcat.c" -o "bin/${OUTBINARY}"
+clean :
+ @if [ -f "bin/${OUTBINARY}" ]; then rm "bin/${OUTBINARY}"; fi;

README.md

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+![](./.github/banner.png)
+
+Prints only printable characters of a file
+
+## Features
+
+ - [x] Prints printable chars from a random file or stream
+
+## Usage
+
+```
+hexcat <file>
+```
+
+## Compilation
+
+Source files are located in `src/` and binary files will go in `bin/`. To compile hexcat, just type :
+
+```
+make
+```
+
+## Fixes
+
+ 1. Binary file (standard input) matches
+
+ ```
+ ./hexcat tests/test.log | grep "li"
+ Binary file (standard input) matches
+
+ ```
+
+## Contributing
+
+Pull requests are welcome. Feel free to open an issue if you want to add other features.

src/hexcat.c

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+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+int printable_chars[98] = {
+ 0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,
+ 0x61,0x62,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6a,
+ 0x6b,0x6c,0x6d,0x6e,0x6f,0x70,0x71,0x72,0x73,0x74,
+ 0x75,0x76,0x77,0x78,0x79,0x7a,0x41,0x42,0x43,0x44,
+ 0x45,0x46,0x47,0x48,0x49,0x4a,0x4b,0x4c,0x4d,0x4e,
+ 0x4f,0x50,0x51,0x52,0x53,0x54,0x55,0x56,0x57,0x58,
+ 0x59,0x5a,0x21,0x22,0x23,0x24,0x25,0x26,0x27,0x28,
+ 0x29,0x2a,0x2b,0x2c,0x2d,0x2e,0x2f,0x3a,0x3b,0x3c,
+ 0x3d,0x3e,0x3f,0x40,0x5b,0x5c,0x5d,0x5e,0x5f,0x60,
+ 0x7b,0x7c,0x7d,0x7e,0x20,0x9,0xa,0xd
+};
+
+// returns 0 if isAuthorized, -1 if not
+int isAuthorized(char c) {
+ for (int i = 0; i < sizeof(printable_chars); i++) {
+ if (printable_chars[i] == c) {
+ return 1;
+ }
+ }
+ return 0;
+}
+
+int clean_buffer(char * buffer, int buffer_size) {
+ int char_index = 0;
+ while (char_index != buffer_size) {
+ if (! isAuthorized(buffer[char_index])) {
+ buffer[char_index] = '.';
+ } else if (buffer[char_index] == '\0') {
+ buffer[char_index] = '.';
+ }
+ char_index++;
+ }
+ return 0;
+}
+
+int hexcat_reader(int in_fd, int out_fd) {
+ char buffer[4096];
+ ssize_t nbytes;
+ while ((nbytes = read(in_fd, buffer, sizeof(buffer))) > 0) {
+ clean_buffer(buffer, sizeof(buffer));
+ if (write(out_fd, buffer, nbytes) != nbytes) {
+ return -1;
+ }
+ }
+ return (nbytes < 0) ? -1 : 0;
+}
+
+
+int main(int argc, char const *argv[]) {
+ if (argc == 1) {
+ if (hexcat_reader(0, 1) != 0) {
+ fprintf(stderr, "[warn] failed to copy stdin.\n");
+ }
+ } else {
+ for (int i = 1; i < argc; i++) {
+ int fd = open(argv[i], O_RDONLY);
+ if (fd < 0) {
+ fprintf(stderr, "[warn] failed to open %s for reading\n", argv[i]);
+ } else {
+ if (hexcat_reader(fd, 1) != 0) {
+ fprintf(stderr, "[warn] failed to copy %s to stdout.\n", argv[i]);
+ }
+ close(fd);
+ }
+ }
+ }
+ return 0;
+}

tests/binfile01

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+D6E$Wv�y�TEcfEh4VhvGEvXy�1122#CS$5E2!VTSAGP�S$`ySB4SF5B2CBC$4AA$1$2411##!2A2422!qg�a's�saQ7bQ#�v8I�'8D�bv'8Gb4XGb4#C$C12!1"!"2112!2!22�2�r'0 80#�

tests/binfile02

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+ �[
+����!!�y� �[]��P[�S��
+����==�N�x=y�y��A����PP%�
+ �[
+ �[
+ �[
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+

tests/test.log.real

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+line1 re ^@^M
+line2^M
+line3 re^M
+

tests/testfile01

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+Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.