conversion.h File Reference

String to number conversion utilities interface. More...

#include <stdint.h>

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Functions
int32_t	str_to_int (const char *s)
	Convert a string to a 32-bit signed integer.
float	str_to_float (const char *s)
	Convert a string to a floating-point number.

Detailed Description

String to number conversion utilities interface.

This header declares functions for converting string representations of numbers to their corresponding integer and floating-point values. The implementations handle:

• Leading/trailing whitespace
• Optional sign indicators (+/-)
• Decimal points for floating-point numbers
• Partial number parsing (stops at first invalid character)

Note

These functions do not handle scientific notation or hexadecimal formats

No overflow/underflow checking is performed

Author

Ashutosh Vishwakarma

Date

2025-07-23

Function Documentation

str_to_float()

float str_to_float

(

const char *

s

)

Convert a string to a floating-point number.

Parameters

s	Null-terminated string to convert (may contain leading whitespace)

Returns

Converted floating-point value

Warning

Limited precision for fractional components

Stops parsing at first non-digit/non-dot character

Convert a string to a floating-point number.

Parses the input string to construct a float value:

1. Skips leading whitespace
2. Processes optional sign
3. Handles both integer and fractional parts
4. Properly tracks decimal point position
5. Stops at first invalid character

Parameters

s	Pointer to null-terminated input string

Returns

Converted floating-point value

Warning

Limited precision for fractional components

No overflow/underflow protection

Example usage:

float val = str_to_float(" 3.1415xyz"); // Returns 3.1415f

str_to_int()

int32_t str_to_int

(

const char *

s

)

Convert a string to a 32-bit signed integer.

Parameters

s	Null-terminated string to convert (may contain leading whitespace)

Returns

Converted 32-bit integer value

Warning

Potential integer overflow with large numbers

Stops parsing at first non-digit character

Convert a string to a 32-bit signed integer.

Parses the input string character by character to construct the integer value:

1. Skips any leading whitespace (spaces/tabs)
2. Processes optional sign character (+/-)
3. Converts subsequent digit characters to integer value
4. Stops at first non-digit character

Parameters

s	Pointer to null-terminated input string

Returns

Converted 32-bit integer value

Warning

Potential for overflow with large numbers

No error reporting for invalid inputs

Example usage:

int val = str_to_int(" -1234abc"); // Returns -1234