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tokenize_asoft: give error if line numbers go backward

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This commit is contained in:
Vince Weaver 2016-05-25 15:11:12 -04:00
parent e1601457af
commit 7ec38fd060
1 changed files with 11 additions and 3 deletions
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14
asoft_basic-utils/tokenize_asoft.c
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@ -157,7 +157,7 @@ int main(int argc, char **argv) {
int offset=2,i;
int linenum,link_offset;
int linenum=0,lastline=0,link_offset;
int link_value=0x801; /* start of applesoft program */
int token;
@ -166,11 +166,19 @@ int main(int argc, char **argv) {
line_ptr=fgets(input_line,BUFSIZ,stdin);
line++;
if (line_ptr==NULL) break;
linenum=getnum();
if (linenum>65535) {
printf("Invalid line number %d\n",linenum);
if ((linenum>65535) || (linenum<0)) {
fprintf(stderr,"Invalid line number %d\n",linenum);
exit(-1);
}
if (linenum<lastline) {
fprintf(stderr,"Line counted backwards %d->%d\n",
lastline,linenum);
exit(-1);
}
lastline=linenum;
link_offset=offset;
check_oflo(offset+4);
output[offset+2]=LOW(linenum);