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dc: code shrink

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function                                             old     new   delta
stack_machine                                        103     101      -2
operators                                            176     168      -8

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2013-01-18 13:30:13 +01:00
parent 7c4b13e019
commit 9daf33fc52
1 changed files with 10 additions and 10 deletions
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20
miscutils/dc.c
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@ -11,11 +11,11 @@
//usage:
//usage:#define dc_full_usage "\n\n"
//usage: "Tiny RPN calculator. Operations:\n"
//usage: "+, add, -, sub, *, mul, /, div, %, mod, "IF_FEATURE_DC_LIBM("**, exp, ")"and, or, not, eor,\n"
//usage: "+, add, -, sub, *, mul, /, div, %, mod, "IF_FEATURE_DC_LIBM("**, exp, ")"and, or, not, xor,\n"
//usage: "p - print top of the stack (without popping),\n"
//usage: "f - print entire stack,\n"
//usage: "o - pop the value and set output radix (must be 10, 16, 8 or 2).\n"
//usage: "Examples: 'dc 2 2 add p' -> 4, 'dc 8 8 * 2 2 + / p' -> 16"
//usage: "Examples: 'dc 2 2 add p' -> 4, 'dc 8 8 mul 2 2 + / p' -> 16"
//usage:
//usage:#define dc_example_usage
//usage: "$ dc 2 2 + p\n"
@ -219,29 +219,29 @@ static const struct op operators[] = {
{"p", print_no_pop},
{"f", print_stack_no_pop},
{"o", set_output_base},
{ "", NULL }
};
static void stack_machine(const char *argument)
{
char *endPointer;
char *end;
double d;
const struct op *o = operators;
const struct op *o;
d = strtod(argument, &endPointer);
if (endPointer != argument && *endPointer == '\0') {
d = strtod(argument, &end);
if (end != argument && *end == '\0') {
push(d);
return;
}
while (o->function) {
o = operators;
do {
if (strcmp(o->name, argument) == 0) {
o->function();
return;
}
o++;
}
} while (o != operators + ARRAY_SIZE(operators));
bb_error_msg_and_die("syntax error at '%s'", argument);
}