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as/lexer/number.c: cleaning up lexer_read_num_dec() abit, skipping goto.

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Henrik Hautakoski 2019-04-03 16:36:41 +02:00
parent 969c092e6f
commit 502f284ebd
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GPG key ID: 839F3A7EAFAEAFAA
1 changed files with 9 additions and 8 deletions
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17
as/lexer/number.c
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@ -52,7 +52,7 @@ overflow:
int lexer_read_num_dec(FILE *fp, int neg, int *out) { int lexer_read_num_dec(FILE *fp, int neg, int *out) {
int c, val = 0; int c, val = 0, oflow = 0;
while((c = fgetc(fp)) != EOF) { while((c = fgetc(fp)) != EOF) {
if (!lexer_is_num(c)) { if (!lexer_is_num(c)) {
@ -64,14 +64,15 @@ int lexer_read_num_dec(FILE *fp, int neg, int *out) {
// Cool trick here. // Cool trick here.
// because the range is -128 (0x80) to +127 (0x7F) // because the range is -128 (0x80) to +127 (0x7F)
// We can do 0x80 - 1 if it is NOT a negative number. // We can do 0x80 - 1 if it is NOT a negative number.
if (val > (0x80 - !neg)) if (val > (0x80 - !neg)) {
goto overflow; // Truncate value.
val = 0x80 - !neg;
oflow = 1;
break;
}
} }
*out = neg ? -1 * val : val; *out = neg ? -1 * val : val;
return 0; return -oflow;
overflow:
*out = neg ? -1 * 0x80 : 0x7F;
return -1;
} }