How to search for a degree symbol `°`?

[Yonut]

Hi,

I'm trying to terminate a string at the first instance of the degree symbol `°`. But when I try:

if((ptr = strchr(data, '°')) == NULL)
...

I get the following error:

error: multi-character character constant [-Werror=multichar

I tried, to use `strstr` in case it might help. It compiled cleanly, but never finds the desired character. I ran through each character, displaying the character and the decimal value. This must be the degree character:

�       194
�       176

Is there a simple way for me to find the position of the first degree symbol in a string? Or do I have crawl through the string, character by character with the following?:

while(ptr[0] != 194 && ptr[1] != 176)
    ptr++;

Ty

[flp1969]

IF you are using a multibyte charset (UTF-8, for example) you should convert this string to wchar_t string and use wcsrchr() instead of strchr():

/* test.c */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <wchar.h>
#include <locale.h>

int main( int argc, char *argv[] )
{
  int n;
  mbstate_t ps;
  wchar_t *dest, *p;
  size_t size;

  if ( argc != 2 )
  {
    fputs( "Usage: test <string>\n", stderr );
    return EXIT_FAILURE;
  }

  // You MUST setup LC_CTYPE for mbsrtowcs() to work!
  setlocale( LC_CTYPE, "en_US.utf8" );

  // allocate space to wchar_t string.
  size = strlen( argv[1] );
  if ( ! ( dest = malloc( sizeof( wchar_t ) * (size + 1) ) ) )
  {
    fputs( "Cannot allocate space for widechar string.\n", stderr );
    return EXIT_FAILURE;
  }

  // Convert multibyte character string to wchar string.
  memset( &ps, 0, sizeof ps );
  mbsrtowcs( dest, (const char **)&argv[1], size, &ps );

  // Try to find 'º' (notice the L in the literal).
  if ( p = wcschr( dest, L'º' ) )
    printf( "%p\n", p );  // print the pointer if found.
  else
    puts( "Not found" );

  free( dest );

  return EXIT_SUCCESS;
}

IF you are using ISO-8859-1 or WINDOWS-1252 encoding (single byte charset), strchr() will work just fine.

[Malcolm McLean]

Hi,
Is there a simple way for me to find the position of the first degree symbol in a string? Or do I have crawl through the string, character by character with the following?:

while(ptr[0] != 194 && ptr[1] != 176)
    ptr++;

Ty

If using UTF-8, just create the degree symbol manually.

const char degreesymbol[3] = {194, 176, 0};

firstdegree = strstr(searchstring, degreesymbol);

[Yonut]

If using UTF-8, just create the degree symbol manually.

const char degreesymbol[3] = {194, 176, 0};

firstdegree = strstr(searchstring, degreesymbol);

That very interesting. Last night I figured I could use `strchr` with 194, as it is the only multibyte character. I don't know why I didn't think of expanding to both and using `strstr`. Ty