my_scanf — Custom scanf Implementation

Author: Naomi Beck

Description

This project implements my_scanf, a custom version of the C scanf function.
The implementation manually parses format strings, handles width and length modifiers, processes variadic arguments, and reads input using a custom buffering mechanism.

The program supports all required conversion specifiers and modifiers for the assignment and includes three custom extensions.

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Supported Conversions

• %c — character input
• %s — string input
• %d — signed decimal integer
• %x — hexadecimal integer
• %f — floating-point value

Modifiers

• Width modifiers (e.g. %4s, %3c, %2x)
• Length modifiers: h, l, ll, L
  • Examples: %d, %ld, %lld, %f, %lf, %Lf
• Assignment suppression via * (e.g. %*d skips an integer without assigning it)

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Custom Extensions

• %q — reads quoted text ("hello world" → hello world)
• %b — reads a binary number and converts it to an integer
• %r — reads the rest of the current line (until newline)

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Example Test Case

The following test demonstrates all three custom extensions used together.

Code

char q[64], r[128];
unsigned int b;

int n = my_scanf("%q %b %r", q, &b, r);
printf("n=%d\nq=[%s]\nb=%u\nr=[%s]\n", n, q, b, r);

Input (stdin): "quoted text" 1011 rest of line here

Output (stdout): n=3 q=[quoted text] b=11 r=[rest of line here]