Expert C Programming

/ figure out the identifier type /

{

char *s = this.string;

if (!strcmp(s, "const")) {

strcpy(s, "read-only");

return QUALIFIER;

}

if (!strcmp(s, "volatile")) return QUALIFIER;

if (!strcmp(s, "void")) return TYPE;

if (!strcmp(s, "char")) return TYPE;

if (!strcmp(s, "signed")) return TYPE;

if (!strcmp(s, "unsigned")) return TYPE;

if (!strcmp(s, "short")) return TYPE;

if (!strcmp(s, "int")) return TYPE;

if (!strcmp(s, "long")) return TYPE;

if (!strcmp(s, "float")) return TYPE;

if (!strcmp(s, "double")) return TYPE;

if (!strcmp(s, "struct")) return TYPE;

if (!strcmp(s, "union")) return TYPE;

if (!strcmp(s, "enum")) return TYPE;

return IDENTIFIER;

}

void gettoken(void)

{ / read next token into "this" /

char *p = this.string;

/ read past any spaces /

while ((*p = getchar()) == ' ');

if (isalnum(*p)) {

/ it starts with A-Z,1-9 read in identifier /

while (isalnum(*++p = getchar()));

ungetc(*p, stdin);

*p = '\0';

this.type = classify_string();

return;

}

this.string[1] = '\0';

this.type = *p;

return;

}

void initialize(),

get_array(), get_params(), get_lparen(),

get_ptr_part(), get_type();

void (*nextstate)(void) = initialize;