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2 Library Reference
AVR Libc Library Reference
2 <avr/pgmspace.h>: Program Space Utilities
2.3 Functions
2.3.43 int memcmp_PF
int memcmp_PF(const void *, uint_farptr_t, size_t) __ATTR_PURE__

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

2.3.43 int memcmp_PF

int memcmp_PF(const void *, uint_farptr_t, size_t) __ATTR_PURE__

The memcmp_PF() function compares the first len bytes of the memory areas s1 and flash s2. The comparision is performed using unsigned char operations. It is an equivalent of memcmp_P() function, except that it is capable working on all FLASH including the exteded area above 64kB.

Remember:

The memcmp_PF() function returns an integer less than, equal to, or greater than zero if the first len bytes of s1 is found, respectively, to be less than, to match, or be greater than the first len bytes of s2.

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