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/*
(C) Copyright 2002-2023 Alex Sisson (alexsisson@gmail.com)
This file is part of shed.
shed is free software; you can redistribute it and/or modify
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
shed is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with shed; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/* includes */
#include <string.h>
#include <stdlib.h>
#include <math.h>
#include <getopt.h>
#include <stdint.h>
#include "util.h"
/* ascii control char descs */
char ascii_short_desc[] = { '0', 0, 0, 0, 0, 0, 0, 'a',
'b', 't', 'n', 'v', 'f', 'r', 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0};
char *ascii_long_desc[] = {"NUL", "SOH", "STX", "ETX", "EOT", "ENQ", "ACK", "BEL",
"BS ", "HT ", "LF ", "VT ", "FF ", "CR ", "SO ", "SI ",
"DLE", "DC1", "DC2", "DC3", "DC4", "NAK", "SYN", "ETB",
"CAN", "EM ", "SUB", "ESC", "FS ", "GS ", "RS ", "US ",
"SPC"};
/* returns a description of the char if its <32 || >126 */
char *getascii(unsigned char c, char *s, int mode)
{
if(c>127)
strcpy(s, " ");
else if(c>=32 && c<=126) {
s[0] = ' ';
s[1] = c;
s[2] = ' ';
s[3] = '\0';
} else {
switch(mode) {
case 1: /* do c-style control chars */
if(c!=127 && ascii_short_desc[c]) {
s[0] = ' ';
s[1] = '\\';
s[2] = ascii_short_desc[c];
s[3] = '\0';
break;
}
case 0: /* no special chars */
strcpy(s, " ");
break;
case 2: /* 3 letter descs */
strcpy(s, c!=127 ? ascii_long_desc[c] : "DEL");
break;
}
}
return s;
}
/* returns string representation of n in base 'base' */
char *getstring(uint64_t n, char *s, int base, int width) {
uint64_t i,j,c,d = calcwidth(n,base);
char *p = s;
if(width && d<width) {
for(i=d;i<width;i++) {
*p = '0';
p++;
}
}
for(i=d;i;i--) {
j = pow(base,i-1);
c = 0;
while(n>=j) {
n-=j;
c++;
}
*p = c + ((c<10) ? 48 : 55);
p++;
}
*p = 0;
return s;
}
/* parses 's' as a 'base' base string */
int64_t parsestring(char *s, int base) {
unsigned int i,j,slen=strlen(s),n=0;
int64_t r = 0;
for(i=0;i<slen;i++) {
if(s[i]>='0' && s[i]<='9')
n = s[i] - 48;
else if(s[i]>='A' && s[i]<='F')
n = s[i] - 55;
else if(s[i]>='a' && s[i]<='f')
n = s[i] - 87;
else
return -1;
if(n>=base)
return -1;
for(j=1;j<slen-i;j++)
n*=base;
r+=n;
}
return r;
}
#include <stdio.h>
/* calculates the width needed to represent 'n' in base 'base' */
int calcwidth(uint64_t n, int base) {
unsigned int i,j;
uint64_t b;
if(!base)
return 0;
for(i=0;;i++) {
b = base;
for(j=0;j<i;j++)
b *= base;
if(b>n || b<base)
return i + 1;
}
return 0;
}
/* creates optstring arg (short opts) from for getopt */
char *getopt_makeoptstring(struct option *opt) {
int n = 0;
char *optstring,*p;
struct option *o = opt;
while(o->name || o->has_arg || o->flag || o->val) {
n += 1 + o->has_arg;
if(o->flag)
return NULL; /* fail because not returning o->val */
o++;
}
p = optstring = malloc(n+1);
o = opt;
while(o->name || o->has_arg || o->flag || o->val) {
*p++ = o->val;
n = o->has_arg;
while(n--)
*p++ = ':';
o++;
}
*p = 0;
return optstring;
}
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