banan-os/userspace/cat/main.cpp

51 lines
709 B
C++

#include <stdio.h>
bool cat_file(FILE* fp)
{
char buffer[1024];
size_t n_read;
while ((n_read = fread(buffer, 1, sizeof(buffer) - 1, fp)) > 0)
{
buffer[n_read] = '\0';
fputs(buffer, stdout);
}
if (ferror(fp))
{
perror("fread");
return false;
}
return true;
}
int main(int argc, char** argv)
{
int ret = 0;
printf("argc %d, argv %p\n", argc, argv);
for (int i = 0; i < argc; i++)
printf("%s\n", argv[i]);
if (argc > 1)
{
for (int i = 1; i < argc; i++)
{
FILE* fp = fopen(argv[i], "r");
if (fp == nullptr)
{
perror(argv[i]);
ret = 1;
continue;
}
if (cat_file(fp))
ret = 1;
fclose(fp);
}
}
else
{
ret = cat_file(stdin);
}
return ret;
}