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#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <sys/stat.h>
static off_t Size(const char *name)
{
struct stat st = {0};
stat(name, &st);
return st.st_size;
}
static void Handle(const char *name)
{
FILE *fp = NULL;
off_t len = Size(name);
unsigned char *buff = NULL;
int write = 0;
if (len < 3)
{
printf("%s: too short\n", name);
return;
}
buff = malloc(len + 2);
fp = fopen(name, "rb");
fread(buff, 1, len, fp);
fclose(fp);
if ((buff[0] == 0xffu && buff[1] == 0xfeu) ||
(buff[0] == 0xfeu && buff[1] == 0xffu))
{
printf("%s: already has BOM\n", name);
free(buff);
return;
}
if (buff[0] == 0 && isascii(buff[1]))
{
printf("%s: Guessing BE UTF-16\n", name);
write = 1;
memmove(buff + 2, buff, len);
buff[0] = 0xfe;
buff[1] = 0xff;
}
else if (buff[1] == 0 && isascii(buff[0]))
{
printf("%s: Guessing LE UTF-16\n", name);
write = 1;
memmove(buff + 2, buff, len);
buff[0] = 0xff;
buff[1] = 0xfe;
}
else
{
printf("%s: Leaving alone\n", name);
}
if (write)
{
fp = fopen(name, "wb");
fwrite(buff, 1, len + 2, fp);
fclose(fp);
}
free(buff);
}
int main(int argc, char *argv[])
{
int f;
for(f = 1; f < argc; f++)
{
Handle(argv[f]);
}
}
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