Linux系统getopt使用示例

 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
 #include <stdint.h>

 void usage()
 {
     fprintf(stderr,
             "\nUsage:  mcu_dload [OPTIONS] *.bin\n"
             "  -a  Specify device I2C slave address(7Bit), eg: -a 5E, default is 0x58\n"
             "  -d  Download binary code for MCU only\n"
             "  -h  This Page.\n\n"
     );
     exit();
 }

 uint8_t asc2hex(char asccode)
 {
     uint8_t ret;
     if('' <= asccode && asccode <= '')
         ret = asccode - '';
     else if('a' <= asccode && asccode <= 'f')
         ret = asccode -'a' + ;
     else if('A' <= asccode && asccode <= 'F')
         ret = asccode - 'A' + ;
     else ret = ;
     return ret;
 }

 int main(int argc, char **argv)
 {
     int opt;
     uint32_t i = ;
     uint8_t i2c_adr = 0x58, i2c_reg;
     FILE *fp;

     // Parse Command Line Options
     while((opt = getopt(argc, argv, "a:h?")) != EOF) {
         switch(opt) {
             case 'a':
                 i2c_adr = (asc2hex(optarg[]) << ) | asc2hex(optarg[]);
                 printf("I2C Device Address(7Bit) is 0x%2X.\n", i2c_adr);
                 break;
             case 'h':
             case '?':
             default:
                 usage();
                 break;
         }
     }

     // Last One is the input file
     if(optind +  != argc) {
         printf("Input file not found!\n");
         usage();
         exit();
     }

     // Open *.bin file and download it to MCU
     fp = fopen(argv[optind], "r");
     if(fp == NULL) {
         printf("Input file can not open!\n");
         usage();
         exit();
     }

     // Get file size
     fseek(fp, 0L, SEEK_SET);
     fseek(fp, 0L, SEEK_END);
     uint32_t binsize = ftell(fp);
     printf("Inpuf file size is %d Bytes.\n", binsize);

     uint8_t *bincode = (uint8_t *)malloc(binsize);
     fseek(fp, 0L, SEEK_SET);
     fread(bincode, 1L, binsize, fp);
     fclose(fp);

     // Download
     printf("Reset MCU ...\n");
     printf("Dowloading bin ...\n");

     uint32_t dpos = binsize >> ;
     for(i = ; i < binsize; ++i) {
         if(i % dpos == ) printf("#");
         usleep();
         //CH341WriteI2C(0, i2c_adr, i2c_reg, bincode[i]);
         fflush(stdout);
     }
     printf("\nFile download succeed, %d Bytes transfered!\n", binsize);

     free(bincode);
     return ;
 }