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An ACS library for ZDoom-based ports

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Number parsing

ACSUtils provides functions to convert strings to numbers.


The parsed numbers can be written in any base from 2 to 36. In bases over 10, letters of the alphabet are used as digits.

If a base is not explicitly specified or is set to 0, base prefixes can be used:

  • 0x – base 16
  • 0o – base 8
  • 0b – base 2

For example, "0xFF" is parsed as 256.

If no base prefix is present, base 10 is used by default

If a base is specified when parsing the number, base prefixes are not supported and their presence is treated as error.


The following errors can happen while parsing a number:

  • PARSENUMBER_OVERFLOW – the number is too big to fit into a variable, the result will be either INT_MAX or INT_MIN.
  • PARSENUMBER_BADFORMAT - the number could not be parsed at all.

Simple functions

These simply return 0 on error, b:


atoi("123") -> 123
atof("123.456") -> 123.456
atoi("abc") -> 0

Complex functions

These return error status and result, and allow specifying an arbitrary base:

Error statuses are:


<code> ParseInt(“123”, 0); r1 → PARSENUMBER_SUCCESS r2 → 123

ParseInt(“10”, 8); In base 8 r1 → PARSENUMBER_SUCCESS r2 → 8 ParseInt(“999999999

number_parsing.txt · Last modified: 2017/03/21 16:28 by korshun