K & R C Programs Exercise 7-2.

K and R C, Solution to Exercise 7-2:
K and R C Programs Exercises provides the solution to all the exercises in the C Programming Language (2nd Edition). You can learn and solve K&R C Programs Exercise.
Write a program that will print arbitrary input in a sensible way. As a minimum, it should print non-graphic characters in octal or hexadecimal according to local custom, and break long text lines. Read more about C Programming Language .

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#include <stdio.h>
#define OCTAL 8
#define HEXADECIMAL 16


void ProcessArgs(int argc, char *argv[], int *output)
{
int i = 0;
while(argc > 1)
{
--argc;
if(argv[argc][0] == '-')
{
i = 1;
while(argv[argc][i] != '')
{
if(argv[argc][i] == 'o')
{
*output = OCTAL;
}
else if(argv[argc][i] == 'x')
{
*output = HEXADECIMAL;
}

++i;
}
}
}
}

int can_print(int ch)
{
char *printable = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890 !"#%&'()*+,-./:;<=>?[\]^_{|}~tfvrn";

char *s;
int found = 0;

for(s = printable; !found && *s; s++)
{
if(*s == ch)
{
found = 1;
}
}

return found;
}

int main(int argc, char *argv[])
{
int split = 80;
int output = HEXADECIMAL;
int ch;
int textrun = 0;
int binaryrun = 0;
char *format;
int width = 0;

ProcessArgs(argc, argv, &output);

if(output == HEXADECIMAL)
{
format = "%02X ";
width = 4;
}
else
{
format = "%3o ";
width = 4;
}

while((ch = getchar()) != EOF)
{
if(can_print(ch))
{
if(binaryrun > 0)
{
putchar('n');
binaryrun = 0;
textrun = 0;
}
putchar(ch);
++textrun;
if(ch == 'n')
{
textrun = 0;
}

if(textrun == split)
{
putchar('n');
textrun = 0;
}
}
else
{
if(textrun > 0 || binaryrun + width >= split)
{
printf("nBinary stream: ");
textrun = 0;
binaryrun = 15;
}
printf(format, ch);
binaryrun += width;
}
}

putchar('n');

return 0;
}

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