135 lines
2 KiB
C
135 lines
2 KiB
C
/*
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* Table of all global definitions. Since the ack convention is to prepend
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* syms with '_' for C interfacing, we need to know about them and add/remove
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* teh '_' as neccessary
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*/
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#include <errno.h>
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#include <string.h>
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#include <ctype.h>
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#include <stdio.h>
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#include "asm86.h"
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/* this should be fine for common minix assembly files */
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#define SYM_MAX 1024
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#define SYM_MAX_LEN 64
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struct sym {
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char name[SYM_MAX_LEN];
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int gl;
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};
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static struct sym syms[SYM_MAX];
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static int syms_num = 0;
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static struct sym * sym_exists(const char * n)
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{
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int i;
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for (i = 0; i < syms_num; i++) {
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if (strcmp(syms[i].name, n) == 0)
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return &syms[i];
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}
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return NULL;
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}
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static int is_local_label_ref(const char *n)
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{
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int i;
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int l = strlen(n);
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for(i = 0; i < l - 1; i++)
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if (!isdigit(n[i]))
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return 0;
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if (n[l-1] != 'b' && n[l-1] != 'f')
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return 0;
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return 1;
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}
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static int is_hex(const char *n)
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{
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int i;
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for(i = 0; n[i]; i++)
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if (!isxdigit(n[i]))
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return 0;
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return 1;
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}
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static int is_dec(const char *n)
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{
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int i;
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for(i = 0; n[i]; i++)
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if (!isdigit(n[i]))
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return 0;
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return 1;
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}
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static int is_number(const char * n)
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{
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if (n[0] == '0' && n[1] == 'x')
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return is_hex(n + 2);
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else
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return is_dec(n);
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}
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int syms_is_global(const char * n)
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{
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struct sym *s;
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if (!n || is_number(n) || is_local_label_ref(n) || isregister(n))
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return 0;
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/* if not found, it must be extern -> global */
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if (!(s = sym_exists(n)))
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return 1;
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return s->gl;
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}
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static int add(const char * n, int isgl)
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{
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if (syms_num >= SYM_MAX)
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return -ENOMEM;
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if (!n || strlen(n) >= SYM_MAX_LEN)
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return -EINVAL;
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/* ignore numbers */
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if (is_number(n))
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return 0;
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strcpy(syms[syms_num].name, n);
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syms[syms_num].gl = isgl;
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syms_num++;
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return 0;
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}
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int syms_add(const char *n)
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{
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return add(n, 0);
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}
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int syms_add_global(const char *n)
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{
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return add(n, 1);
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}
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void syms_add_global_csl(expression_t * exp)
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{
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if (!exp)
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return;
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if (exp->operator == ',') {
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syms_add_global_csl(exp->left);
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syms_add_global_csl(exp->right);
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}
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else {
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syms_add_global(exp->name);
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}
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}
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