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main.c
74 lines (59 loc) · 1.95 KB
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main.c
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#include <stdio.h>
#include <stdlib.h> /* for free(3) */
#include <readline.h>
#include <ctype.h> /* for isspace(3) */
#include "base-conv.h"
#define ever (;;)
int prompt_number(const char *prompt, uint64_t *number, unsigned int base);
int main(int argc, char **argv) {
uint64_t from=0, to=0;
for ever {
uint64_t number;
char buf[65];
char *converted;
while(from < 2) {
if(prompt_number("From: ", &from, 10)) {
from = 0;
fputs("You must give a number\n", stderr);
} else if(from < 2) fputs("You must give a number greater than two\n", stderr);
}
while(to < 2) {
if(prompt_number("To: ", &to, 10)) {
to = 0;
fputs("You must give a number\n", stderr);
} else if(to < 2) fputs("You must give a number greater than two\n", stderr);
}
printf("Converting from base-%d to base-%d\n", from, to);
if(prompt_number("Number: ", &number, from)) {
fputs("You must enter a valid number in that base (case-sensitive... A is 10, a is 42)\n",stderr);
fflush(stderr);
} else {
if((converted=serialize_number(number, (unsigned char) to, buf))) {
puts(converted);
} else {
fputs("Could not convert the number\n", stderr);
}
}
}
return 0;
}
int prompt_number(const char *prompt, uint64_t *number, unsigned int base) {
char *string = readline(prompt);
int start=0;
if(string == NULL) {return -1; };
{ /* Trim Whitespace */
int i=strlen(string);
while (isspace(string[i])) string[i] = 0;
while(isspace(string[start])) ++start;
}
if(strlen(string+start) == 0) {
free(string);
return -1;
}
if(parse_number(string+start, base, number)) {
free(string);
return -1;
};
free(string);
return 0;
}