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,,string.c

typedef unsigned int size_t;

// 7.21.2.1: memcpy

char *memcpy(char *s1, const char *s2, size_t n) {
  char *r = s1;
  while (n-- > 0) *s1++ = *s2++;
  return r;
}

// 7.21.2.2: memmove

char *memmove(char *s1, const char *s2, size_t n) {
  char *tmp;
  if (n < 1) return s1;
  tmp = (char*)malloc(n * sizeof(char));
  memcpy(tmp,s2,n);
  memcpy(s1,tmp,n);
  return s1;
}

// 7.21.2.3: strcpy

char *strcpy(char *s1, const char *s2) {
  char *r = s1;
  while (*s1++ = *s2++) ;
  return r;
}

// 7.21.2.4: strncpy

char* strncpy(char *s1, const char *s2, size_t n) {
  char *r = s1;
  while ((n-- > 0) && (*s1++ = *s2++)) ;
  while (n-- > 0) *s1++ = 0;
  return r;
}

// 7.21.3.1: strcat

char *strcat (char *s1, const char *s2) {
  char *r = s1;
  while (*s1) s1++;
  strcpy(s1,s2);
  return r;
}

// 7.21.3.2: strncat

char *strncat (char *s1, const char *s2, size_t n) {
  char *r = s1;
  while (*s1) s1++;
  while ((n-- > 0) && (*s1++ = *s2++)) ;
  if (n >= 0) *s1 = 0;
  return r;
}

// 7.21.4.1: memcmp

int memcmp (const char *s1, const char *s2, size_t n) {
  int c;
  while (n-- > 0) {
    if ((c = *s1++ - *s2++) != 0) return c;
  }
  return 0;
}

// 7.21.4.2: strcmp

int strcmp (const char *s1, const char *s2) {
  int c;
  while (*s1 && *s2) {
    c = *s1++ - *s2++;
    if (c != 0) return c;
  }
  c = *s1 - *s2;
  return c;
}

// 7.21.4.3: strcoll

int strcoll (const char *s1, const char *s2) {
  return strcmp(s1,s2);
}

// 7.21.4.4: strncmp

int strncmp (const char *s1, const char *s2, size_t n) {
  int c = 0;
  while (*s1 && *s2 && (n-- > 0)) {
    c = *s1++ - *s2++;
    if (c != 0) return c;
  }
  if (n > 0) c = *s1 - *s2;
  return c;
}

// 7.21.4.4: strxfrm

size_t strxfrm (char *s1, const char *s2, size_t n) {
  size_t n1 = 0;
  while (*s2) {
    if (n-- > 0) *s1++ = *s2;
    s2++; n1++;
  }
  if (n > 0) *s1 = 0;
  return n1;
}

// 7.21.5.1: memchr

char *memchr (const char *s, char c, size_t n) {
  while (n-- > 0) {
    if (*s++ == c) return s-1;
  }
  return 0;
}

// 7.21.5.2: strchr

char *strchr (const char *s, char c) {
  while (*s) {
    if (*s++ == c) return s-1;
  }
  if (*s == c) return s;
  return 0;
}

// 7.21.5.3: strcspn

size_t strcspn (const char *s1, const char *s2) {
  size_t n = 0;
  while (*s1 && strchr(s2,*s1++) == 0) ++n;
  return n;
}

// 7.21.5.4: strpbrk

char *strpbrk (const char *s1, const char *s2) {
  while (strchr(s2,*s1) == 0) ++s1;
  if (*s1) return s1;
  return 0;
}

// 7.21.5.5: strrchr

char *strrchr(const char *s, char c) {
  char *r = 0;
  while (*s) {
    if (*s++ == c) r = s-1;
  }
  if (c == 0) r = s;
  return r;
}

// 7.21.5.6: strspn

size_t strspn (const char *s1, const char *s2) {
  size_t n = 0;
  while (*s1 && strchr(s2,*s1++) != 0) ++n;
  return n;
}

// 7.21.5.7: strstr

char *strstr (const char *s1, const char *s2) {
  if (*s2 == 0) return s1;
  while (*s1) { 
    const char *rs1 = s1;
    const char *rs2 = s2;
    while (*rs1 && *rs2 && (*rs1++ == *rs2)) rs2++;
    if (*rs2 == 0) return s1;
    s1++;
  }
  return 0;
}

// 7.21.5.8: strtok

static char *tok;

char *strtok (char *s1, const char *s2) {
  char *r = 0;
  size_t n;
  if (s1 == 0) s1 = tok;
  s1 += strspn(s1,s2);
  if ((n = strcspn(s1,s2)) > 0) {
    r = s1;
    tok = s1 + n;
    if (*tok != 0) *tok++ = 0;
  }
  return r;
}

// 7.21.6.1: memset

char *memset (char *s, char c, size_t n) {
  char *r = s;
  while (n-- > 0) *s++ = c;
  return r;
}

// 7.21.6.2: strerror

static char errbuf[1024];

extern char** errmsg;

char *strerror (int errnum) {
  strcpy(errbuf,errmsg[errnum-1]);
  return errbuf;
}

// 7.21.6.3: strlen

size_t strlen(const char *s) {
  size_t n = 0;
  while (*s++) ++n;
  return n;
}

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