toolchain/gcc/newlib/libc/string/strupr.c

   1 /*
   2 FUNCTION
   3         <<strupr>>---force string to uppercase
   4
   5 INDEX
   6         strupr
   7
   8 ANSI_SYNOPSIS
   9         #include <string.h>
  10         char *strupr(char *<[a]>);
  11
  12 TRAD_SYNOPSIS
  13         #include <string.h>
  14         char *strupr(<[a]>)
  15         char *<[a]>;
  16
  17 DESCRIPTION
  18         <<strupr>> converts each characters in the string at <[a]> to
  19         upper case.
  20
  21 RETURNS
  22         <<strupr>> returns its argument, <[a]>.
  23
  24 PORTABILITY
  25 <<strupr>> is not widely portable.
  26
  27 <<strupr>> requires no supporting OS subroutines.
  28
  29 QUICKREF
  30         strupr */
  31
  32 #include <string.h>
  33 #include <ctype.h>
  34
  35 char *
  36 strupr (a)
  37      char *a;
  38 {
  39   char *ret = a;
  40
  41   while (*a != '\0')
  42     {
  43       if (islower (*a))
  44         *a = toupper (*a);
  45       ++a;
  46     }
  47
  48   return ret;
  49 }