/* vi: set sw=4 ts=4: */
/*
- * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
#include "libbb.h"
#include <math.h>
//usage:#define dc_trivial_usage
-//usage: "expression..."
+//usage: "EXPRESSION..."
//usage:
//usage:#define dc_full_usage "\n\n"
//usage: "Tiny RPN calculator. Operations:\n"
-//usage: "+, add, -, sub, *, mul, /, div, %, mod, **, 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, o - pop the value and set output radix\n"
-//usage: "(value must be 10, 16, 8 or 2).\n"
-//usage: "Examples: 'dc 2 2 add' -> 4, 'dc 8 8 * 2 2 + /' -> 16\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 mul 2 2 + / p' -> 16"
//usage:
//usage:#define dc_example_usage
//usage: "$ dc 2 2 + p\n"
{"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++;
- }
- bb_error_msg_and_die("syntax error at '%s'", argument);
-}
+ } while (o != operators + ARRAY_SIZE(operators));
-/* return pointer to next token in buffer and set *buffer to one char
- * past the end of the above mentioned token
- */
-static char *get_token(char **buffer)
-{
- char *current = skip_whitespace(*buffer);
- if (*current != '\0') {
- *buffer = skip_non_whitespace(current);
- return current;
- }
- return NULL;
+ bb_error_msg_and_die("syntax error at '%s'", argument);
}
int dc_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
while ((line = xmalloc_fgetline(stdin)) != NULL) {
cursor = line;
while (1) {
- token = get_token(&cursor);
- if (!token)
+ token = skip_whitespace(cursor);
+ if (*token == '\0')
break;
- *cursor++ = '\0';
+ cursor = skip_non_whitespace(token);
+ if (*cursor != '\0')
+ *cursor++ = '\0';
stack_machine(token);
}
free(line);
}
} else {
- // why? it breaks "dc -2 2 * p"
+ // why? it breaks "dc -2 2 + p"
//if (argv[0][0] == '-')
// bb_show_usage();
do {