mirrors/cosmopolitan
1
0
Fork 0
mirror of https://github.com/jart/cosmopolitan.git synced 2025-05-22 21:32:31 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 1

Add function for creating hex string literals

Browse source
This commit is contained in:
Justine Tunney 2021-08-07 07:05:19 -07:00
parent aeeb851422
commit 1f766a332f
14 changed files with 250 additions and 112 deletions
Download patch file Download diff file Expand all files Collapse all files

41
libc/stdio/appendr.c
View file

@ -20,6 +20,7 @@
#include "libc/dce.h"
#include "libc/macros.internal.h"
#include "libc/mem/mem.h"
#include "libc/nexgen32e/bsr.h"
#include "libc/stdio/append.internal.h"
#include "libc/str/str.h"
@ -37,35 +38,39 @@
* free(b);
*
* If `i` is greater than the current length then the extra bytes are
* filled with NUL characters.
* filled with NUL characters. If `i` is less than the current length
* then memory is released to the system.
*
* The resulting buffer is guarranteed to be NUL-terminated, i.e.
* `!b[appendz(b).i]` will be the case.
* `!b[appendz(b).i]` will be the case even if both params are 0.
*
* @return `i` or -1 if `ENOMEM`
* @see appendz(b).i to get buffer length
*/
ssize_t appendr(char **b, size_t i) {
char *p;
size_t n;
struct appendz z;
assert(b);
z = appendz((p = *b));
z.n = ROUNDUP(i + 1, 8) + W;
if ((p = realloc(p, z.n))) {
z.n = malloc_usable_size(p);
assert(!(z.n & (W - 1)));
*b = p;
} else {
return -1;
if (i != z.i || !p) {
n = ROUNDUP(i + 1, 8) + W;
if (n > z.n || bsrl(n) < bsrl(z.n)) {
if ((p = realloc(p, n))) {
n = malloc_usable_size(p);
assert(!(n & (W - 1)));
*b = p;
} else {
return -1;
}
}
if (i > z.i) {
memset(p + z.i, 0, i - z.i + 1);
} else {
p[i] = 0;
}
*(size_t *)(p + n - W) =
i | (!IsTiny() && W == 8 ? (size_t)APPEND_COOKIE << 48 : 0);
}
if (i > z.i) {
memset(p, z.i, i - z.i);
}
z.i = i;
p[z.i] = 0;
if (!IsTiny() && W == 8) {
z.i |= (size_t)APPEND_COOKIE << 48;
}
*(size_t *)(p + z.n - W) = z.i;
return i;
}