Non-standard functions

Collaboration diagram for Non-standard functions:

Functions
char *	lwip_strnstr (const char *buffer, const char *token, size_t n)
char *	lwip_strnistr (const char *buffer, const char *token, size_t n)
int	lwip_stricmp (const char *str1, const char *str2)
int	lwip_strnicmp (const char *str1, const char *str2, size_t len)
void	lwip_itoa (char *result, size_t bufsize, int number)

Detailed Description

lwIP provides default implementations for non-standard functions. These can be mapped to OS functions to reduce code footprint if desired. All defines related to this section must not be placed in lwipopts.h, but in arch/cc.h! These options cannot be #defined in lwipopts.h since they are not options of lwIP itself, but options of the lwIP port to your system.

Function Documentation

lwip_itoa()

void lwip_itoa	(	char *	result,
		size_t	bufsize,
		int	number
	)

lwIP default implementation for itoa() non-standard function. This can be #defined to itoa() or snprintf(result, bufsize, "%d", number) depending on your platform port.

Definition at line 222 of file def.c.

{
  char *res = result;
  char *tmp = result + bufsize - 1;
  int n = (number >= 0) ? number : -number;
 
  /* handle invalid bufsize */
  if (bufsize < 2) {
    if (bufsize == 1) {
      *result = 0;
    }
    return;
  }
 
  /* First, add sign */
  if (number < 0) {
    *res++ = '-';
  }
  /* Then create the string from the end and stop if buffer full,
     and ensure output string is zero terminated */
  *tmp = 0;
  while ((n != 0) && (tmp > res)) {
    char val = (char)('0' + (n % 10));
    tmp--;
    *tmp = val;
    n = n / 10;
  }
  if (n) {
    /* buffer is too small */
    *result = 0;
    return;
  }
  if (*tmp == 0) {
    /* Nothing added? */
    *res++ = '0';
    *res++ = 0;
    return;
  }
  /* move from temporary buffer to output buffer (sign is not moved) */
  memmove(res, tmp, (size_t)((result + bufsize) - tmp));
}

Referenced by file_write_http_header(), netif_index_to_name(), and test_def_itoa().

lwip_stricmp()

int lwip_stricmp	(	const char *	str1,
		const char *	str2
	)

lwIP default implementation for stricmp() non-standard function. This can be #defined to stricmp() depending on your platform port.

Definition at line 151 of file def.c.

{
  char c1, c2;
 
  do {
    c1 = *str1++;
    c2 = *str2++;
    if (c1 != c2) {
      char c1_upc = c1 | 0x20;
      if ((c1_upc >= 'a') && (c1_upc <= 'z')) {
        /* characters are not equal an one is in the alphabet range:
        downcase both chars and check again */
        char c2_upc = c2 | 0x20;
        if (c1_upc != c2_upc) {
          /* still not equal */
          /* don't care for < or > */
          return 1;
        }
      } else {
        /* characters are not equal but none is in the alphabet range */
        return 1;
      }
    }
  } while (c1 != 0);
  return 0;
}

lwip_strnicmp()

int lwip_strnicmp	(	const char *	str1,
		const char *	str2,
		size_t	len
	)

lwIP default implementation for strnicmp() non-standard function. This can be #defined to strnicmp() depending on your platform port.

Definition at line 186 of file def.c.

{
  char c1, c2;
 
  do {
    c1 = *str1++;
    c2 = *str2++;
    if (c1 != c2) {
      char c1_upc = c1 | 0x20;
      if ((c1_upc >= 'a') && (c1_upc <= 'z')) {
        /* characters are not equal an one is in the alphabet range:
        downcase both chars and check again */
        char c2_upc = c2 | 0x20;
        if (c1_upc != c2_upc) {
          /* still not equal */
          /* don't care for < or > */
          return 1;
        }
      } else {
        /* characters are not equal but none is in the alphabet range */
        return 1;
      }
    }
    len--;
  } while ((len != 0) && (c1 != 0));
  return 0;
}

Referenced by lwip_strnistr().

lwip_strnistr()

char * lwip_strnistr	(	const char *	buffer,
		const char *	token,
		size_t	n
	)

lwIP default implementation for strnistr() non-standard function. This can be #defined to strnistr() depending on your platform port.

Definition at line 128 of file def.c.

{
  const char *p;
  size_t tokenlen = strlen(token);
  if (tokenlen == 0) {
    return LWIP_CONST_CAST(char *, buffer);
  }
  for (p = buffer; *p && (p + tokenlen <= buffer + n); p++) {
    if (lwip_strnicmp(p, token, tokenlen) == 0) {
      return LWIP_CONST_CAST(char *, p);
    }
  }
  return NULL;
}

lwip_strnstr()

char * lwip_strnstr	(	const char *	buffer,
		const char *	token,
		size_t	n
	)

lwIP default implementation for strnstr() non-standard function. This can be #defined to strnstr() depending on your platform port.

Definition at line 105 of file def.c.

{
  const char *p;
  size_t tokenlen = strlen(token);
  if (tokenlen == 0) {
    return LWIP_CONST_CAST(char *, buffer);
  }
  for (p = buffer; *p && (p + tokenlen <= buffer + n); p++) {
    if ((*p == *token) && (strncmp(p, token, tokenlen) == 0)) {
      return LWIP_CONST_CAST(char *, p);
    }
  }
  return NULL;
}