/** \ingroup rpmio
 * \file rpmio/strcasecmp.c
 */

#include "system.h"
#include "rpmio.h"
#include "debug.h"

static
const unsigned char tolower_map[] = {
    0000, 0001, 0002, 0003, 0004, 0005, 0006, 0007,
    0010, 0011, 0012, 0013, 0014, 0015, 0016, 0017,
    0020, 0021, 0022, 0023, 0024, 0025, 0026, 0027,
    0030, 0031, 0032, 0033, 0034, 0035, 0036, 0037,
    0040, 0041, 0042, 0043, 0044, 0045, 0046, 0047,
    0050, 0051, 0052, 0053, 0054, 0055, 0056, 0057,
    0060, 0061, 0062, 0063, 0064, 0065, 0066, 0067,
    0070, 0071, 0072, 0073, 0074, 0075, 0076, 0077,
    0100, 0141, 0142, 0143, 0144, 0145, 0146, 0147,
    0150, 0151, 0152, 0153, 0154, 0155, 0156, 0157,
    0160, 0161, 0162, 0163, 0164, 0165, 0166, 0167,
    0170, 0171, 0172, 0133, 0134, 0135, 0136, 0137,
    0140, 0141, 0142, 0143, 0144, 0145, 0146, 0147,
    0150, 0151, 0152, 0153, 0154, 0155, 0156, 0157,
    0160, 0161, 0162, 0163, 0164, 0165, 0166, 0167,
    0170, 0171, 0172, 0173, 0174, 0175, 0176, 0177,
    0200, 0201, 0202, 0203, 0204, 0205, 0206, 0207,
    0210, 0211, 0212, 0213, 0214, 0215, 0216, 0217,
    0220, 0221, 0222, 0223, 0224, 0225, 0226, 0227,
    0230, 0231, 0232, 0233, 0234, 0235, 0236, 0237,
    0240, 0241, 0242, 0243, 0244, 0245, 0246, 0247,
    0250, 0251, 0252, 0253, 0254, 0255, 0256, 0257,
    0260, 0261, 0262, 0263, 0264, 0265, 0266, 0267,
    0270, 0271, 0272, 0273, 0274, 0275, 0276, 0277,
    0300, 0301, 0302, 0303, 0304, 0305, 0306, 0307,
    0310, 0311, 0312, 0313, 0314, 0315, 0316, 0317,
    0320, 0321, 0322, 0323, 0324, 0325, 0326, 0327,
    0330, 0331, 0332, 0333, 0334, 0335, 0336, 0337,
    0340, 0341, 0342, 0343, 0344, 0345, 0346, 0347,
    0350, 0351, 0352, 0353, 0354, 0355, 0356, 0357,
    0360, 0361, 0362, 0363, 0364, 0365, 0366, 0367,
    0370, 0371, 0372, 0373, 0374, 0375, 0376, 0377,
};

#define xtolower(c) tolower_map[(unsigned char)(c)]

int xstrcasecmp(const char * s1, const char * s2)
{
  const char * p1 = s1;
  const char * p2 = s2;
  char c1, c2;

  if (p1 == p2)
    return 0;

  do
    {
      c1 = xtolower (*p1++);
      c2 = xtolower (*p2++);
      if (c1 == '\0')
        break;
    }
  while (c1 == c2);

  return (int)(c1 - c2);
}

int xstrncasecmp(const char *s1, const char *s2, size_t n)
{
  const char * p1 = s1;
  const char * p2 = s2;
  char c1, c2;

  if (p1 == p2 || n == 0)
    return 0;

  do
    {
      c1 = xtolower (*p1++);
      c2 = xtolower (*p2++);
      if (c1 == '\0' || c1 != c2)
	break;
    } while (--n > 0);

  return (int)(c1 - c2);
}