Technical Notes
OverviewWhen strings are involved in character conversions, it is assumed that they are ASCIIZ strings (i.e., NULL terminated).
Examples of how to use the remaining Spontaneous Assembly character classification functions are given below. For each of these functions the JE condition is returned if the character matches the classification and the JNE condition is returned if it does not match the classification.
The following code assumes INLINE.H has been included:
Example 1 (is_alnum): Example 2 (is_alpha):
get_chr (); get_chr():
is_alnum (); is_alpha();
jne alnum_10 jne alpha_10
/* Alphanumeric keystroke */ /* Handle a "non-alpha" keystroke */
jmp short alnum_20 jmp short alpha_20
alnum_10: alpha_10:
/* Non alphanumeric keystroke */ /* Handle an "alpha" keystroke */
alnum_20: alpha_20:
Example 3 (is_cntrl): Example 9 (is_punct):
get_chr (); get_chr():
is_cntrl (); is_punct();
jne cntrl_20 jne punct_10
/* Handle a control keypress */ /* Punctuation character */
jmp short cntrl_20 jmp short punct_20
cntrl_10: punct_10:
/* Handle a non-control keypress */ /* Non-punctuation character */
cntrl_20: punct_20:
put_newline ();
Example 4 (is_digit): Example 10 (is_space):
get_chr (); get_chr():
is_digit (); is_space():
jne digit_10 jne space_10
/* Numeric keypress */ /* Space character */
jmp short digit_20 jmp short space_20
digit_10: space_10:
/* Non-numeric keypress */ /* Non-space character */
digit_20: space_20:
put_newline ();
Example 5 (is_graph): Example 11 (is_wspace):
get_chr (); get_chr();
is_graph (); is_wspace();
jne graph_10 jne wspace_10
/* Graphics character */ /* A whitespace character */
jmp short graph_20 jmp short wspace_20
graph_10: wspace_10:
/* Non-graphics character */ /* Non-whitespace character */
graph_20: wspace_20:
put_newline ();
Example 6 (is_lower): Example 12 (is_xdigit):
get_chr (); get_chr();
is_lower (); is_xdigit();
jne lower_10 jne xdigit_10
/* Lowercase character */ /* Hexadecimal character */
jmp short lower_20 jmp short xdigit_20
lower_10: xdigit_10:
/* Non-lowercase character */ /* Non-hexadecimal character */
lower_20: xdigit_20:
put_newline ();
Example 7 (is_upper): Example 13 (is_xspace):
get_chr (); get_chr();
is_upper (); is_xspace();
jne is_upper_10 jne xspace_10
/* Uppercase character */ /* Extended space character */
jmp short jmp short xspace_20
is_upper_20 xspace_10:
is_upper_10: /* Non-extended space character */
/* Non-uppercase character */ xspace_20:
is_upper_20: _put_newline ();
Example 8 (is_print):
get_chr ();
is_print ();
jne print_10
/* Printable character */
jmp short print_20
print_10:
/* Non-printable character */
print_20:
put_newline ();
These case conversion functions only affect ASCII alphabetic characters which are not already the indicated case. Note that IBM PC international characters (characters codes above 127) are not affected by this function.
#include
#include
#define ESC 27
void main (void)
{
char chr;
_put_str ("Press escape to exit...");
_put_newline ();
_put_str ("Press a key... ");
chr = _get_chr ();
while (chr != ESC)
{
if (chr == 0) /* ignore extended keypress */
_get_chr ();
else {
char high,low;
_put_str (" Character: ");
_put_chr (chr);
_put_str (" Uppercase: ");
_put_chr (_to_upper (chr));
_put_str (" Lowercase: ");
_put_chr (_to_lower (chr));
_put_newline ();
_put_str ("Press a key... ");
}
chr = _get_chr ();
}
}
Microsoft C:
cl /c /I\msc\include /I\sa\include char.c
link char,char,,\sa\lib\_sas \msc\lib\slibce
bcc /c /ms /I\bc\include /I\sa\include char.c
tlink \bc\lib\c0s char,char,,\sa\lib\_sas \bc\lib\cs