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QNX Software Development Platform
QNX SDP is a cross-compiling and debugging environment, including an IDE and command-line tools, for building binary images and programs for target boards running the QNX OS 8.0.
Utilities & Libraries
QNX Helpers Developer's Guide
These libraries provide QNX helpers, including helpers that assist with logging, string conversion, and number and type sizes.
string.h
QNX helpers - Helpers related to strings and string conversions.

QNX Momentics IDE User's Guide
This User's Guide describes version 8.0 of the Integrated Development Environment (IDE) that's part of the QNX Tool Suite.
QNX Software Development Platform
QNX SDP is a cross-compiling and debugging environment, including an IDE and command-line tools, for building binary images and programs for target boards running the QNX OS 8.0.
- Quickstart Guide
- System Architecture
  The System Architecture guide accompanies the QNX OS and is intended for both application developers and end-users.
- OS Components & Operations
- Graphics
- Programming
- System Security Guide
  The QNX System Security Guide is intended for both system integrators who are responsible for the security of a QNX OS system and developers who want to create a QNX OS resource manager free from vulnerabilities.
- Utilities & Libraries
  - C Library Reference
  - Devctl and Ioctl Commands
  - JSON Library Reference
  - PAM Reference
  - QNX Helpers Developer's Guide
    These libraries provide QNX helpers, including helpers that assist with logging, string conversion, and number and type sizes.
    - attr.h
      QNX helpers - Attribute helpers.
    - endian.h
      QNX helpers - Endianness-related helpers.
    - error.h
      QNX helpers - Helpers related to the errno variable.
    - io.h
      QNX helpers - IO helpers.
    - log.h
      QNX helpers related to logging.
    - misc.h
      QNX helpers - Miscellaneous helpers.
    - qh.h
      QNX helpers that set QH_FILENAME.
    - size.h
      QNX helpers - Size-related helpers.
    - string.h
      QNX helpers - Helpers related to strings and string conversions.
      - Macros
        These macros make a string from a passed-in argument name or value.
      - qh_malloc_sprintf()
        Print formatted output into a newly allocated string
      - qh_memclear()
        Set the memory to zero
      - qh_str()
        Return a specified string, a fallback string if the specified string is NULL, or an empty string if the fallback string is also NULL
      - qh_str_groupname_to_gid()
        Safely converts a string into a gid_t
      - qh_str_to_bool()
        Safely converts a string into a boolean
      - qh_str_to_bytes()
        Safely converts a string representing a size in bytes with an optional size suffix into a uint64_t
      - qh_str_to_char()
        Safely converts a string into a char
      - qh_str_to_errno()
        Safely converts a string that represents an errno symbol or number into its corresponding errno value (an int)
      - qh_str_to_int()
        Safely converts a string into an int
      - qh_str_to_int8()
        Safely converts a string into an int8_t
      - qh_str_to_int16()
        Safely converts a string into an int16_t
      - qh_str_to_int32()
        Safely converts a string into an int32_t
      - qh_str_to_int64()
        Safely converts a string into an int64_t
      - qh_str_to_long()
        Safely converts a string into a long
      - qh_str_to_llong()
        Safely converts a string into a llong
      - qh_str_to_mode()
        Safely converts a string into a mode_t
      - qh_str_to_schar()
        Safely converts a string into a signed char
      - qh_str_to_signal()
        Safely converts a string that represents a signal name or number into an int
      - qh_str_to_size()
        Safely converts a string into a size_t
      - qh_str_to_ssize()
        Safely converts a string into a ssize_t
      - qh_str_to_uchar()
        Safely converts a string into an unsigned char
      - qh_str_to_uint()
        Safely converts a string into an unsigned int
      - qh_str_to_uint8()
        Safely converts a string into a uint8_t
      - qh_str_to_uint16()
        Safely converts a string into a uint16_t
      - qh_str_to_uint32()
        Safely converts a string into a uint32_t
      - qh_str_to_uint64()
        Safely converts a string into a uint64_t
      - qh_str_to_ullong()
        Safely converts a string into an unsigned long long
      - qh_str_to_ulong()
        Safely converts a string into an unsigned long
      - qh_str_username_to_uid()
        Safely converts a string into a uid_t
      - qh_strcmp()
        Safely compare two strings
      - qh_strdup()
        Safely create a duplicate of a string
    - time.h
      QNX helpers - Helpers related to time.
  - SPI Framework Technote
  - Utilities Reference
  - WPA Control Interface Reference
    This document provides a reference for the Wi-Fi Protected Access (WPA) control interface, which provides a C API for the WPA/IEEE 802.11i protocols in Wi-Fi client stations. Application developers who want to control WPA operations and get associated status and event data should read this reference.
- Migrating to QNX OS 8.0
QNX Software in the Cloud
QNX Software in the Cloud enables developers to use the QNX OS in the Amazon cloud environment.
QNX Toolkit for Visual Studio Code
This User's Guide describes the QNX^® Toolkit for Visual Studio Code. The guide introduces you to the QNX Toolkit by explaining the QNX development environment and how to build, run, and debug your QNX^® Operating System (OS) applications and systems.
QNX Hypervisor User's Guide
This User's Guide explains the QNX hypervisor architecture and provides instructions for installing and running a QNX Hypervisor system, changing system components and configuration, and using hypervisor features such as virtual devices (vdevs).
Typographical Conventions, Support, and Licensing
This section describes the typographical conventions used throughout the documentation, explains how to obtain technical support, and provides some information about licensing.

string.h

QNX SDP8.0QNX Helpers Developer's GuideAPIDeveloper

QNX helpers - Helpers related to strings and string conversions.

Page updated: March 05, 2025