banan-os/userspace/u8sum/main.cpp

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#include <fcntl.h>
#include <stdio.h>
int main(int argc, char** argv)
{
for (int i = 1; i < argc; i++)
{
FILE* fp = fopen(argv[i], "r");
if (fp == nullptr)
{
perror("nullptr");
continue;
}
uint8_t sum = 0;
uint8_t buffer[1024];
while (size_t ret = fread(buffer, 1, sizeof(buffer), fp))
for (int j = 0; j < ret; j++)
sum += buffer[j];
if (ferror(fp))
perror("fread");
else
printf("%s: %02x\n", argv[i], sum);
fclose(fp);
}
}