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/* hexedit -- Hexadecimal Editor for Binary Files
Copyright (C) 1998 Pixel (Pascal Rigaux)
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.*/
#include "hexedit.h"
int LSEEK_(int fd, INT where)
{
INT result;
result = lseek(fd, where, SEEK_SET);
return (result == where) ? 1 : -1;
}
void LSEEK(int fd, INT where)
{
INT result;
result = lseek(fd, where, SEEK_SET);
if (result != where) {
exitCurses();
fprintf(stderr, "the long seek failed (%lld instead of %lld), leaving :(\n", (long long) result, (long long) where);
exit(1);
}
}
/*******************************************************************************/
/* Functions provided for OSs that don't have them */
/*******************************************************************************/
#ifndef HAVE_BASENAME
char *basename(const char *file) {
char *p = strrchr(file, '/');
return p ? p + 1 : file;
}
#endif
#ifndef HAVE_STRERROR
char *strerror(int errnum) {
extern char *sys_errlist[];
extern int sys_nerr;
if (errnum > 0 && errnum <= sys_nerr)
return sys_errlist[errnum];
return _("Unknown system error");
}
#endif
#ifndef HAVE_STRDUP
char *strdup(const char *str)
{
size_t len = strlen(str) + 1;
void *new = malloc(len);
if (new == NULL) return NULL;
return (char *) bcopy(str, new, len);
}
#endif
/*******************************************************************************/
/* Small common functions */
/*******************************************************************************/
int streq(const char *s1, const char *s2) { return strcmp(s1, s2) == 0; }
INT myfloor(INT a, INT b) { return a - a % b; }
int setLowBits(int p, int val) { return (p & 0xF0) + val; }
int setHighBits(int p, int val) { return (p & 0x0F) + val * 0x10; }
char *strconcat3(char *a, char *b, char *c)
{
size_t la = a ? strlen(a) : 0;
size_t lb = b ? strlen(b) : 0;
size_t lc = c ? strlen(c) : 0;
char *p = malloc(la + lb + lc + 1);
if (a) memcpy(p, a, la);
if (b) memcpy(p + la, b, lb);
if (c) memcpy(p + la + lb, c, lc);
p[la + lb + lc] = '\0';
return p;
}
int hexCharToInt(int c)
{
if (isdigit(c)) return c - '0';
return tolower(c) - 'a' + 10;
}
int not(int b) { return b ? FALSE: TRUE; }
#ifndef HAVE_MEMRCHR
char *memrchr(void *s, char c, int n)
{
char *p = s;
int i;
for (i = 0; i > -n; i--) if (p[i] == c) return &p[i];
return NULL;
}
#endif
char *mymemmem(char *a, int sizea, char *b, int sizeb)
{
#ifdef HAVE_MEMMEM
memmem(a, sizea, b, sizeb);
#else
char *p;
int i = sizea - sizeb + 1;
for (; (p = memchr(a, b[0], i)); i -= p - a + 1, a = p + 1)
{
if ((memcmp(p + 1, b + 1, sizeb - 1)) == 0) {
return p;
}
}
return NULL;
#endif
}
char *mymemrmem(char *a, int sizea, char *b, int sizeb)
{
#ifdef HAVE_MEMRMEM
memrmem(a, sizea, b, sizeb);
#else
char *p;
int i = sizea - sizeb + 1;
a += sizea - 1;
for (; (p = memrchr(a, b[sizeb - 1], i)); i -= a - p + 1, a = p - 1)
{
if ((memcmp(p - sizeb + 1, b, sizeb - 1)) == 0) return p;
}
return NULL;
#endif
}
int hexStringToBinString(char *p, int *l)
{
int i;
for (i = 0; i < *l; i++) {
if (!isxdigit(p[i])) {
displayMessageAndWaitForKey("Invalid hexa string");
return FALSE;
}
p[i / 2] = ((i % 2) ? setLowBits : setHighBits)(p[i / 2], hexCharToInt(p[i]));
}
if ((*l % 2)) {
displayMessageAndWaitForKey("Must be an even number of chars");
return FALSE;
}
*l /= 2;
return TRUE;
}
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