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main.c
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main.c
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//
// main.c
//
//
// Copyright 2015 Jacob Wahlgren
//
//
#include "pcalc_prefix.h"
#include <stdlib.h>
#include <stdio.h>
#include <assert.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>
#include "pcalc.h"
#include "settings.h"
const char *retcode_str(enum retcode ret)
{
switch(ret) {
case PCALC_OK: return "No errors occurred";
case PCALC_MEMORY_ALLOC: return "Memory allocation failed";
case PCALC_OUT_OF_BOUNDS: return "Value out of bounds";
case PCALC_NOT_ENOUGH_VALUES: return "Not enough values";
case PCALC_UKNOWN_TOKEN: return "Uknown token";
case PCALC_INVALID_EXPRESSION: return "Invalid expression";
case PCALC_NO_LAST_ANS: return "No previous answer";
default: assert(0);
}
}
void print_error(char *expr, char *errp, enum retcode ret)
{
if (expr && errp) {
assert (errp >= expr);
if (expr[strlen(expr) - 1] == '\n')
expr[strlen(expr) - 1] = '\0';
fprintf(stderr,
"Error: %s\n"
"\t%s\n"
"\t",
retcode_str(ret), expr);
for (size_t i = 0; i < errp - expr; i++)
fputc(' ', stderr);
fprintf(stderr, "^\n");
}
else {
fprintf(stderr, "Error: %s\n", retcode_str(ret));
}
}
void print_number(struct settings *s, int n)
{
switch (s->output) {
case BASE_DECIMAL:
printf("%d", n);
break;
case BASE_HEX:
if (n == INT_MIN) {
print_error(NULL, NULL, PCALC_OUT_OF_BOUNDS);
}
else {
printf("0x");
if (n < 0) {
putchar('-');
n *= -1;
}
printf("%X\n", n);
}
break;
default:
assert(0);
}
}
void usage(int exit_value)
{
printf("Usage: pcalc [<option>...]\n"
" pcalc [<option>...] <expression>\n"
"\n"
" -i infix notation (default)\n"
" -r postfix notation (rpn)\n"
" -p prefix notation\n"
" -c print config path and exit\n"
" -w print settings and exit\n"
" -h show this help\n"
);
exit(exit_value);
}
void parse_argv(int *argcp, char ***argvp, struct settings *s)
{
const char *optstr =
"r" // postfix (rpn)
"p" // prefix (pn)
"i" // infix
"c" // print config path
"w" // print settings
"h" // show help
;
int c;
while ((c = getopt(*argcp, *argvp, optstr)) != -1)
switch (c) {
case 'r':
s->notation = POSTFIX;
break;
case 'p':
s->notation = PREFIX;
break;
case 'i':
s->notation = INFIX;
break;
case 'c':
{
char path[PATH_MAX];
get_config_path(path);
printf("%s\n", path);
exit(EXIT_SUCCESS);
}
case 'w':
write_settings(s, stdout);
exit(EXIT_SUCCESS);
case 'h':
usage(EXIT_SUCCESS);
case '?':
default:
usage(EXIT_FAILURE);
}
*argcp -= optind - 1;
*argvp += optind - 1;
}
int prompt_loop(struct settings *s)
{
char *prompt = NULL;
int *last_ans = NULL;
char *expr = NULL;
size_t len = 0;
int result;
switch (s->notation) {
case PREFIX:
prompt = "pcalc[p]";
break;
case POSTFIX:
prompt = "pcalc[r]";
break;
case INFIX:
prompt = "pcalc[i]";
break;
default:
assert(0);
}
fprintf(stderr, "Type 'q' or 'quit' to exit\n");
for (;;) {
printf("%s> ", prompt);
if (getline(&expr, &len, stdin) > 0) {
if (expr[0] == '\n') {
continue;
}
else if (strcmp(expr, "q\n") == 0 || strcmp(expr, "quit\n") == 0) {
free(expr);
return EXIT_SUCCESS;
}
else {
char *errp;
enum retcode ret;
switch (s->notation) {
case PREFIX:
ret = pn_eval_str(&result, &errp, expr, 0, last_ans);
break;
case POSTFIX:
ret = pn_eval_str(&result, &errp, expr,
PCALC_REVERSED, last_ans);
break;
case INFIX:
ret = inf_eval_str(&result, &errp, expr, last_ans);
break;
default:
assert(0);
}
if (ret == PCALC_OK) {
print_number(s, result);
last_ans = &result;
}
else {
print_error(expr, errp, ret);
}
}
}
else {
free(expr);
if (feof(stdin)) {
putc('\n', stdout);
return EXIT_SUCCESS;
}
else {
perror("Reading input failed");
return EXIT_FAILURE;
}
}
}
}
int main(int argc, char **argv)
{
struct settings settings;
read_settings(&settings);
parse_argv(&argc, &argv, &settings);
if (argc == 1) {
return prompt_loop(&settings);
}
else {
char str[1024];
str[0] = '\0';
for (int i = 1; i < argc; i++) {
strcat(str, argv[i]);
strcat(str, " ");
}
int result = 0;
char *errp;
enum retcode ret;
switch (settings.notation) {
case PREFIX:
ret = pn_eval_str(&result, &errp, str, 0, NULL);
break;
case POSTFIX:
ret = pn_eval_str(&result, &errp, str,
PCALC_REVERSED, NULL);
break;
case INFIX:
ret = inf_eval_str(&result, &errp, str, NULL);
break;
default:
assert(0);
}
if (ret == PCALC_OK) {
print_number(&settings, result);
return EXIT_SUCCESS;
}
else {
print_error(str, errp, ret);
return EXIT_FAILURE;
}
}
}