1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/libc/ctype.c	Sat Feb 11 08:56:42 2017 +0200
     1.3 @@ -0,0 +1,60 @@
     1.4 +int isalpha(int c);
     1.5 +int isdigit(int c);
     1.6 +int islower(int c);
     1.7 +int isupper(int c);
     1.8 +
     1.9 +
    1.10 +int isalnum(int c)
    1.11 +{
    1.12 +	return isalpha(c) || isdigit(c);
    1.13 +}
    1.14 +
    1.15 +int isalpha(int c)
    1.16 +{
    1.17 +	return isupper(c) || islower(c);
    1.18 +}
    1.19 +
    1.20 +int isblank(int c)
    1.21 +{
    1.22 +	return c == ' ' || c == '\t';
    1.23 +}
    1.24 +
    1.25 +int isdigit(int c)
    1.26 +{
    1.27 +	return c >= '0' && c <= '9';
    1.28 +}
    1.29 +
    1.30 +int isupper(int c)
    1.31 +{
    1.32 +	return c >= 'A' && c <= 'Z';
    1.33 +}
    1.34 +
    1.35 +int islower(int c)
    1.36 +{
    1.37 +	return c >= 'a' && c <= 'z';
    1.38 +}
    1.39 +
    1.40 +int isgraph(int c)
    1.41 +{
    1.42 +	return c > ' ' && c <= '~';
    1.43 +}
    1.44 +
    1.45 +int isprint(int c)
    1.46 +{
    1.47 +	return isgraph(c) || c == ' ';
    1.48 +}
    1.49 +
    1.50 +int isspace(int c)
    1.51 +{
    1.52 +	return isblank(c) || c == '\f' || c == '\n' || c == '\r' || c == '\v';
    1.53 +}
    1.54 +
    1.55 +int toupper(int c)
    1.56 +{
    1.57 +	return islower(c) ? (c + ('A' - 'a')) : c;
    1.58 +}
    1.59 +
    1.60 +int tolower(int c)
    1.61 +{
    1.62 +	return isupper(c) ? (c + ('A' - 'a')) : c;
    1.63 +}