xxd，16进制打印

xxd.h

#ifndef ANALYZER_XXD_H
#define ANALYZER_XXD_H

#ifdef __cplusplus
extern "C" {
#endif
#include <stdlib.h> /* getenv */

typedef unsigned char byte;
typedef unsigned char uint8_t;
typedef unsigned short uint16_t;

typedef void (*sFn_t)(byte *s, uint8_t len, void *pn);

/* log文件大于1M之后改名为 debug.log-bak, 重新写入debug.log */
#define bcl_debug(fmt, ...) \
  do { \
     char path[255];        \
     long fl = 0;           \
     snprintf(path, 255, "%s/log/debug.log", getenv("FAPWORKDIR")); \
     FILE *fp = fopen(path, "a");                                   \
     fl = ftell(fp);        \
     if (fl > 1048576) {    \
         fclose(fp);        \
         char npath[255];   \
         strcpy(npath, path);  strcat(npath, "-bak");     \
         rename(path, npath);                                       \
         fp = fopen(path, "w"); \
     }   \
     fprintf(fp, fmt, ##__VA_ARGS__);     \
     fclose(fp);              \
  } while (0); \

int readFromFile(const char *path, sFn_t fn, void *pn);

void xxd(byte *s, uint8_t len, void *param);

#ifdef __cplusplus
}
#endif

#endif //ANALYZER_XXD_H

* xxd.c

#include "xxd.h"
#include <stdio.h> /* FILE */
#include <string.h> /* strncmp, memset */
#include <errno.h> /* errno */

int readFromFile(const char *path, sFn_t fn, void *pn) {
    FILE *fp = NULL;
    if (0 == strncmp(path, "stdin", 5)) {
        fp = stdin;
    } else {
        fp = fopen(path, "r");
        if (NULL == fp) {
            fprintf(stderr, "ERROR(%d) open %s: %s", errno, path, strerror(errno));
            return errno;
        }
    }
    byte buf[16];
    size_t br = 0;
    while (!feof(fp)) {
        memset(buf, 0, 16);
        br = fread(buf, sizeof(byte), 16, fp);
        if (br < 1) {break;}
        fn(buf, br, pn);
    }
    fclose(fp);
    return 0;
}

void xxd(byte *s, uint8_t len, void *param) {
    uint8_t i;
    uint16_t *line = (uint16_t *)param;
    fprintf(stdout, "%08x:", *line << 4);
    for (i = 0; i+2 < len; i+=2) {
        fprintf(stdout, " %02x%02x", s[i], s[i+1]);
    }
    if (i <len) {fprintf(stdout, " %02x", s[i]); i+= 1;}
    if (i <len) {fprintf(stdout, "%02x", s[i]); i+=1;}
    if (i < 16 && 0x00 != (i & 0x01)) { fputs("  ", stdout); i+=1;}
    for (; i <16; i+= 2) {
        bcl_debug("i=%d\n", i);
        fputs("     ", stdout); /* space * 5 */
    }
    fputs("  ", stdout);
    for (i = 0; i <len; i++) {
        if (s[i] <0x20 || s[i] > 0x7e) {
            fputc('.', stdout);
        } else {
            fputc(s[i], stdout);
        }
    }
    fputs("\r\n", stdout);
    *line += 1;
}

* main.cpp

#ifdef __cplusplus
extern "C" {
#endif
#include <string.h>
#include "xxd.h"

int main(int argc, char *argv[])
{
    char sIn[255];
    if (argc < 2) {
        strcpy(sIn, "stdin");
    } else {
        strncpy(sIn, argv[1], 255);
    }
    uint16_t line = 0;
    readFromFile(sIn, xxd, &line);
}
#ifdef __cplusplus
};
#endif

* CMakeLists.txt

cmake_minimum_required(VERSION 3.16)
project(analyzer)

set(CMAKE_CXX_STANDARD 11)

add_executable(xxd main.cpp xxd.c xxd.h)

配置环境变量FAPWORKDIR，为了记录日志

Makefile

CC=cc
CFLAGS=-g -Wextra -O2 -fPIC -std=c99
SHLIBLDOPT=-shared -fPIC
AROPT=-curv
BINDIR=
APPBINDIR=
TOOLBINDIR=${FAPWORKDIR}/tbin

OBJ=xxd
TARGETS=${OBJ}

.c.o:
    ${CC} ${CFLAGS} -c $< -o $@

all: ${TARGETS}
clean:
    rm -f ${OBJ}.o ${TARGETS}
install:
    cp ${OBJ} ${TOOLBINDIR}/${OBJ}
uninstall:
    rm -f ${TOOLBINDIR}/${OBJ}