eqi.h File Reference

Case-insensitive fixed-chunk comparisons. More...

#include <stdbool.h>
#include <stdint.h>
#include <string.h>

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Functions
static uint64_t	make_lowercase_mask (uint64_t x, int bytenum)
	Create a mask to lowercase alphabetic characters.
static bool	eqi1 (const char *a, const char b[1])
	Compare two 1-byte strings, ignoring case - See: Case-insensitive fixed-chunk comparisons.
static bool	eqi2 (const char *a, const char b[2])
	Compare two 2-byte strings, ignoring case - See: Case-insensitive fixed-chunk comparisons.
static bool	eqi4 (const char *a, const char b[4])
	Compare two 4-byte strings, ignoring case - See: Case-insensitive fixed-chunk comparisons.
static bool	eqi8 (const char *a, const char b[8])
	Compare two 8-byte strings, ignoring case - See: Case-insensitive fixed-chunk comparisons.
static bool	eqi5 (const char *a, const char b[5])
	eqi5 - Compare two 5-byte strings, ignoring case - See: Case-insensitive fixed-chunk comparisons
static bool	eqi6 (const char *a, const char b[6])
	eqi6 - Compare two 6-byte strings, ignoring case - See: Case-insensitive fixed-chunk comparisons
static bool	eqi9 (const char *a, const char b[9])
	eqi9 - Compare two 9-byte strings, ignoring case - See: Case-insensitive fixed-chunk comparisons
static bool	eqi10 (const char *a, const char b[10])
	eqi10 - Compare two 10-byte strings, ignoring case - See: Case-insensitive fixed-chunk comparisons
static bool	eqi11 (const char *a, const char b[11])
	eqi11 - Compare two 11-byte strings, ignoring case - See: Case-insensitive fixed-chunk comparisons
static bool	eqi12 (const char *a, const char b[12])
	eqi12 - Compare two 12-byte strings, ignoring case - See: Case-insensitive fixed-chunk comparisons
static bool	eqi13 (const char *a, const char b[13])
	eqi13 - Compare two 13-byte strings, ignoring case - See: Case-insensitive fixed-chunk comparisons
static bool	eqi14 (const char *a, const char b[14])
	eqi14 - Compare two 14-byte strings, ignoring case - See: Case-insensitive fixed-chunk comparisons
static bool	eqi15 (const char *a, const char b[15])
	eqi15 - Compare two 15-byte strings, ignoring case - See: Case-insensitive fixed-chunk comparisons
static bool	eqi16 (const char *a, const char b[16])
	eqi16 - Compare two 16-byte strings, ignoring case - See: Case-insensitive fixed-chunk comparisons
static bool	eqi17 (const char *a, const char b[17])
	eqi17 - Compare two 17-byte strings, ignoring case - See: Case-insensitive fixed-chunk comparisons

Detailed Description

Case-insensitive fixed-chunk comparisons.

Authors

• Steinar H Gunderson

Copyright

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.

Definition in file eqi.h.

Function Documentation

make_lowercase_mask()

static uint64_t make_lowercase_mask ( uint64_t x, int bytenum )

inlinestatic

Create a mask to lowercase alphabetic characters.

Parameters

x	Character to test
bytenum	Which byte position to set

Return values

num

Bitmask

Utility for the functions below

If the character is alphabetic, then the position determines where to shift the 0x20 mask.

• Position 0: 0x00000020
• Position 1: 0x00002000
• Position 2: 0x00200000
• Position 3: 0x20000000

Definition at line 65 of file eqi.h.

{
  const char ch = x >> (bytenum * 8);
  const uint64_t mask = ((ch >= 'a') && (ch <= 'z')) ? 0x20 : 0;
  return mask << (bytenum * 8);
}

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eqi1()

static bool eqi1 ( const char * a, const char b[1] )

inlinestatic

Compare two 1-byte strings, ignoring case - See: Case-insensitive fixed-chunk comparisons.

Parameters

a	First string
b	Second string, must be lower case

Return values

true	Strings match

Definition at line 78 of file eqi.h.

{
  uint8_t b8 = b[0];
  return (*a | make_lowercase_mask(b8, 0)) == (unsigned char) b[0];
}

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eqi2()

static bool eqi2 ( const char * a, const char b[2] )

inlinestatic

Compare two 2-byte strings, ignoring case - See: Case-insensitive fixed-chunk comparisons.

Parameters

a	First string
b	Second string, must be lower case

Return values

true	Strings match

Definition at line 90 of file eqi.h.

{
  uint16_t a16 = 0;
  uint16_t b16 = 0;
  memcpy(&a16, a, sizeof(a16));
  memcpy(&b16, b, sizeof(b16));
  const uint16_t lowercase_mask = make_lowercase_mask(b16, 0) |
                                  make_lowercase_mask(b16, 1);
  return (a16 | lowercase_mask) == b16;
}

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eqi4()

static bool eqi4 ( const char * a, const char b[4] )

inlinestatic

Compare two 4-byte strings, ignoring case - See: Case-insensitive fixed-chunk comparisons.

Parameters

a	First string
b	Second string, must be lower case

Return values

true	Strings match

Definition at line 107 of file eqi.h.

{
  uint32_t a32 = 0;
  uint32_t b32 = 0;
  memcpy(&a32, a, sizeof(a32));
  memcpy(&b32, b, sizeof(b32));
  const uint32_t lowercase_mask = make_lowercase_mask(b32, 0) |
                                  make_lowercase_mask(b32, 1) |
                                  make_lowercase_mask(b32, 2) |
                                  make_lowercase_mask(b32, 3);
  return (a32 | lowercase_mask) == b32;
}

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eqi8()

static bool eqi8 ( const char * a, const char b[8] )

inlinestatic

Compare two 8-byte strings, ignoring case - See: Case-insensitive fixed-chunk comparisons.

Parameters

a	First string
b	Second string, must be lower case

Return values

true	Strings match

Definition at line 126 of file eqi.h.

{
  uint64_t a64 = 0;
  uint64_t b64 = 0;
  memcpy(&a64, a, sizeof(a64));
  memcpy(&b64, b, sizeof(b64));
  const uint64_t lowercase_mask = make_lowercase_mask(b64, 0) |
                                  make_lowercase_mask(b64, 1) |
                                  make_lowercase_mask(b64, 2) |
                                  make_lowercase_mask(b64, 3) |
                                  make_lowercase_mask(b64, 4) |
                                  make_lowercase_mask(b64, 5) |
                                  make_lowercase_mask(b64, 6) |
                                  make_lowercase_mask(b64, 7);
  return (a64 | lowercase_mask) == b64;
}

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eqi5()

static bool eqi5 ( const char * a, const char b[5] )

inlinestatic

eqi5 - Compare two 5-byte strings, ignoring case - See: Case-insensitive fixed-chunk comparisons

Definition at line 148 of file eqi.h.

{
  return eqi4(a, b) && eqi1(a + 1, b + 1);
}

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eqi6()

static bool eqi6 ( const char * a, const char b[6] )

inlinestatic

eqi6 - Compare two 6-byte strings, ignoring case - See: Case-insensitive fixed-chunk comparisons

Definition at line 154 of file eqi.h.

{
  return eqi4(a, b) && eqi2(a + 4, b + 4);
}

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eqi9()

static bool eqi9 ( const char * a, const char b[9] )

inlinestatic

eqi9 - Compare two 9-byte strings, ignoring case - See: Case-insensitive fixed-chunk comparisons

Definition at line 162 of file eqi.h.

{
  return eqi8(a, b) && eqi1(a + 8, b + 8);
}

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eqi10()

static bool eqi10 ( const char * a, const char b[10] )

inlinestatic

eqi10 - Compare two 10-byte strings, ignoring case - See: Case-insensitive fixed-chunk comparisons

Definition at line 168 of file eqi.h.

{
  return eqi8(a, b) && eqi2(a + 8, b + 8);
}

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eqi11()

static bool eqi11 ( const char * a, const char b[11] )

inlinestatic

eqi11 - Compare two 11-byte strings, ignoring case - See: Case-insensitive fixed-chunk comparisons

Definition at line 174 of file eqi.h.

{
  return eqi8(a, b) && eqi4(a + 7, b + 7);
}

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eqi12()

static bool eqi12 ( const char * a, const char b[12] )

inlinestatic

eqi12 - Compare two 12-byte strings, ignoring case - See: Case-insensitive fixed-chunk comparisons

Definition at line 180 of file eqi.h.

{
  return eqi8(a, b) && eqi4(a + 8, b + 8);
}

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eqi13()

static bool eqi13 ( const char * a, const char b[13] )

inlinestatic

eqi13 - Compare two 13-byte strings, ignoring case - See: Case-insensitive fixed-chunk comparisons

Definition at line 186 of file eqi.h.

{
  return eqi8(a, b) && eqi8(a + 5, b + 5);
}

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eqi14()

static bool eqi14 ( const char * a, const char b[14] )

inlinestatic

eqi14 - Compare two 14-byte strings, ignoring case - See: Case-insensitive fixed-chunk comparisons

Definition at line 192 of file eqi.h.

{
  return eqi8(a, b) && eqi8(a + 6, b + 6);
}

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eqi15()

static bool eqi15 ( const char * a, const char b[15] )

inlinestatic

eqi15 - Compare two 15-byte strings, ignoring case - See: Case-insensitive fixed-chunk comparisons

Definition at line 198 of file eqi.h.

{
  return eqi8(a, b) && eqi8(a + 7, b + 7);
}

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eqi16()

static bool eqi16 ( const char * a, const char b[16] )

inlinestatic

eqi16 - Compare two 16-byte strings, ignoring case - See: Case-insensitive fixed-chunk comparisons

Definition at line 204 of file eqi.h.

{
  return eqi8(a, b) && eqi8(a + 8, b + 8);
}

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eqi17()

static bool eqi17 ( const char * a, const char b[17] )

inlinestatic

eqi17 - Compare two 17-byte strings, ignoring case - See: Case-insensitive fixed-chunk comparisons

Definition at line 210 of file eqi.h.

{
  return eqi16(a, b) && eqi1(a + 16, b + 16);
}

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