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cable16
Joined: 22 Mar 2005
Posts: 22
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 Posted: Wed Aug 10, 2005 3:10 am Post subject: _itoa question |
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I recently installed cygwin, pspsdk, and the toolchain, and I'm having some problems getting _itoa(int n, char *buf, int radix) from stdlib to work. There's some code I have that used the pspsdk beta, and I'm trying to get it to work under my cygwin install now. When the code used the beta, I manually added an itoa function to my headers, because the beta's stdlib didn't have a itoa function back then. Now, the code uses the sdk's function, and it doesn't work right.
this leaves tmp empty:
| Code: |
#include <stdlib.h>
char *tmp = &freespace;
long long int offset = 33526363;
_itoa(offset, &tmp, 16);
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this will leave tmp as "1FF925B":
| Code: |
// declared outright
char *test_itoa(int n, char *buf, int radix)
{
char *ret = buf;
char tmp[33];
int i = 0, j, r;
/* validate the conversion number base. */
if ((radix >= 2) && (radix <= 36)) {
if ((radix == 10) && (n < 0)) {
/* negative integer value. */
*buf++ = '-';
n = -n;
}
do {
/* calculate the current digit. */
r = (int)((unsigned int)n % radix);
tmp[i++] = ((r < 10) ? (r + '0') : (r - 10 + 'a'));
} while ((n /= radix) != 0);
/* reverse the buffer string. */
for (--i, j = 0; (i >= 0); --i, ++j) buf[j] = tmp[i];
buf[j] = 0;
}
return (ret);
}
char *tmp = &freespace;
long long int offset = 33526363;
test_itoa(offset, &tmp, 16);
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Shine
Joined: 03 Dec 2004
Posts: 728
Location: Germany
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| Posted: Wed Aug 10, 2005 4:55 am Post subject: Re: _itoa question |
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this leaves tmp empty:
| Code: |
#include <stdlib.h>
char *tmp = &freespace;
long long int offset = 33526363;
_itoa(offset, &tmp, 16);
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use _itoa(offset, tmp, 16); and then buy and read some C learning book ;-) |
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cable16
Joined: 22 Mar 2005
Posts: 22
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| Posted: Thu Aug 11, 2005 1:50 am Post subject: |
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ok, oops, that's a messup in the sample I posted, in the real code it uses like you said | Code: | | _itoa(offset, tmp, 16); |
The problem is, if I declare my own itoa function it will work correctly, but if I use the sdk's function in libpsplibc.a it won't work.
this doesn't work
| Code: |
#include <stdlib.h>
int main(void)
{
char *tmp = &freespace;
long long int offset = 33526363;
_itoa(offset, tmp, 16);
}
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this does
| Code: |
char *test_itoa(int n, char *buf, int radix)
{
char *ret = buf;
char tmp[33];
int i = 0, j, r;
/* validate the conversion number base. */
if ((radix >= 2) && (radix <= 36)) {
if ((radix == 10) && (n < 0)) {
/* negative integer value. */
*buf++ = '-';
n = -n;
}
do {
/* calculate the current digit. */
r = (int)((unsigned int)n % radix);
tmp[i++] = ((r < 10) ? (r + '0') : (r - 10 + 'a'));
} while ((n /= radix) != 0);
/* reverse the buffer string. */
for (--i, j = 0; (i >= 0); --i, ++j) buf[j] = tmp[i];
buf[j] = 0;
}
return (ret);
}
int main(void)
{
char *tmp = &freespace;
long long int offset = 33526363;
test_itoa(offset, tmp, 16);
}
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