AVRLibc

AVR Libc
1 User Manual
2 Library Reference
AVR Libc Library Reference
- 2 <alloca.h>: Allocate space in the stack
- 2 <assert.h>: Diagnostics
- 2 <avr/boot.h>: Bootloader Support Utilities
- 2 <avr/cpufunc.h>: Special AVR CPU functions
- 2 <avr/eeprom.h>: EEPROM handling
- 2 <avr/fuse.h>: Fuse Support
- 2 <avr/interrupt.h>: Interrupts
- 2 <avr/io.h>: AVR device-specific IO definitions
- 2 <avr/lock.h>: Lockbit Support
- 2 <avr/pgmspace.h>: Program Space Utilities
  - 2.1 Defines
  - 2.2 Typedefs
  - 2.3 Functions
    - 2.3.1 const void * memchr_P
      const void * memchr_P(const void *, int __val, size_t __len)
    - 2.3.2 int memcmp_P
      int memcmp_P(const void *, const void *, size_t) __ATTR_PURE__
    - 2.3.3 void * memccpy_P
      void * memccpy_P(void *, const void *, int __val, size_t)
    - 2.3.4 void * memcpy_P
      void * memcpy_P(void *, const void *, size_t)
    - 2.3.5 void * memmem_P
      void * memmem_P(const void *, size_t, const void *, size_t) __ATTR_PURE__
    - 2.3.6 const void memrchr_P
      const void memrchr_P(const void *, int __val, size_t __len)
    - 2.3.7 char * strcat_P
      char * strcat_P(char *, const char *)
    - 2.3.8 const char * strchr_P
      const char * strchr_P(const char *, int __val)
    - 2.3.9 const char * strchrnul_P
      const char * strchrnul_P(const char *, int __val)
    - 2.3.10 int strcmp_P
      int strcmp_P(const char *, const char *) __ATTR_PURE__
    - 2.3.11 char * strcpy_P
      char * strcpy_P(char *, const char *)
    - 2.3.12 int strcasecmp_P
      int strcasecmp_P(const char *, const char *) __ATTR_PURE__
    - 2.3.13 char * strcasestr_P
      char * strcasestr_P(const char *, const char *) __ATTR_PURE__
    - 2.3.14 size_t strcspn_P
      size_t strcspn_P(const char *__s, const char *__reject) __ATTR_PURE__
    - 2.3.15 size_t strlcat_P
      size_t strlcat_P(char *, const char *, size_t)
    - 2.3.16 size_t strlcpy_P
      size_t strlcpy_P(char *, const char *, size_t)
    - 2.3.17 size_t strnlen_P
      size_t strnlen_P(const char *, size_t)
    - 2.3.18 int strncmp_P
      int strncmp_P(const char *, const char *, size_t) __ATTR_PURE__
    - 2.3.19 int strncasecmp_P
      int strncasecmp_P(const char *, const char *, size_t) __ATTR_PURE__
    - 2.3.20 char * strncat_P
      char * strncat_P(char *, const char *, size_t)
    - 2.3.21 char * strncpy_P
      char * strncpy_P(char *, const char *, size_t)
    - 2.3.22 char * strpbrk_P
      char * strpbrk_P(const char *__s, const char *__accept) __ATTR_PURE__
    - 2.3.23 const char * strrchr_P
      const char * strrchr_P(const char *, int __val)
    - 2.3.24 char * strsep_P
      char * strsep_P(char **__sp, const char *__delim)
    - 2.3.25 size_t strspn_P
      size_t strspn_P(const char *__s, const char *__accept) __ATTR_PURE__
    - 2.3.26 char * strstr_P
      char * strstr_P(const char *, const char *) __ATTR_PURE__
    - 2.3.27 char * strtok_P
      char * strtok_P(char *__s, const char *__delim)
    - 2.3.28 char * strtok_rP
      char * strtok_rP(char *__s, const char *__delim, char **__last)
    - 2.3.29 size_t strlen_PF
      size_t strlen_PF(uint_farptr_t src)
    - 2.3.30 size_t strnlen_PF
      size_t strnlen_PF(uint_farptr_t src, size_t len)
    - 2.3.31 void * memcpy_PF
      void * memcpy_PF(void *dest, uint_farptr_t src, size_t len)
    - 2.3.32 char * strcpy_PF
      char * strcpy_PF(char *dest, uint_farptr_t src)
    - 2.3.33 char * strncpy_PF
      char * strncpy_PF(char *dest, uint_farptr_t src, size_t len)
    - 2.3.34 char * strcat_PF
      char * strcat_PF(char *dest, uint_farptr_t src)
    - 2.3.35 size_t strlcat_PF
      size_t strlcat_PF(char *dst, uint_farptr_t src, size_t siz)
    - 2.3.36 char * strncat_PF
      char * strncat_PF(char *dest, uint_farptr_t src, size_t len)
    - 2.3.37 int strcmp_PF
      int strcmp_PF(const char *s1, uint_farptr_t s2) __ATTR_PURE__
    - 2.3.38 int strncmp_PF
      int strncmp_PF(const char *s1, uint_farptr_t s2, size_t n) __ATTR_PURE__
    - 2.3.39 int strcasecmp_PF
      int strcasecmp_PF(const char *s1, uint_farptr_t s2) __ATTR_PURE__
    - 2.3.40 int strncasecmp_PF
      int strncasecmp_PF(const char *s1, uint_farptr_t s2, size_t n) __ATTR_PURE__
    - 2.3.41 char * strstr_PF
      char * strstr_PF(const char *s1, uint_farptr_t s2)
    - 2.3.42 size_t strlcpy_PF
      size_t strlcpy_PF(char *dst, uint_farptr_t src, size_t siz)
    - 2.3.43 int memcmp_PF
      int memcmp_PF(const void *, uint_farptr_t, size_t) __ATTR_PURE__
    - 2.3.44 size_t strlen_P
      size_t strlen_P(const char *s)
- 2 <avr/power.h>: Power Reduction Management
- 2 <avr/sfr_defs.h>: Special function registers
- 2 <avr/signature.h>: Signature Support
- 2 <avr/sleep.h>: Power Management and Sleep Modes
- 2 <avr/version.h>: avr-libc version macros
- 2 <avr/wdt.h>: Watchdog timer handling
- 2 <compat/deprecated.h>: Deprecated items
- 2 <compat/ina90.h>: Compatibility with IAR EWB 3.x
- 2 <ctype.h>: Character Operations
- 2 <errno.h>: System Errors
- 2 <inttypes.h>: Integer Type conversions
- 2 <math.h>: Mathematics
- 2 <setjmp.h>: Non-local goto
- 2 <stdint.h>: Standard Integer Types
- 2 <stdio.h>: Standard IO facilities
- 2 <stdlib.h>: General utilities
- 2 <string.h>: Strings
- 2 <time.h>: Time
- 2 <util/atomic.h> Atomically and Non-Atomically Executed Code Blocks
- 2 <util/crc16.h>: CRC Computations
- 2 <util/delay.h>: Convenience functions for busy-wait delay loops
- 2 <util/delay_basic.h>: Basic busy-wait delay loops
- 2 <util/parity.h>: Parity bit generation
- 2 <util/setbaud.h>: Helper macros for baud rate calculations
- 2 <util/twi.h>: TWI bit mask definitions
- 2.1 Structures
3 Example Projects
4 Files

2.3.44 size_t strlen_P

size_t strlen_P(const char *s)

The strlen_P() function is similar to strlen(), except that src is a pointer to a string in program space.

Remember:

The strlen_P() function returns the number of characters in src.

Note:

strlen_P() is implemented as an inline function in the avr/pgmspace.h header file, which will check if the length of the string is a constant and known at compile time. If it is not known at compile time, the macro will issue a call to __strlen_P() which will then calculate the length of the string as normal.

The online versions of the documents are provided as a courtesy. Verify all content and data in the device’s PDF documentation found on the device product page.