#pragma ident "@(#)strptr.c 1.12 08/05/31 SMI"
#include "libelf.h"
#include "decl.h"
#include "msg.h"
char *
elf_strptr(Elf * elf, size_t ndx, size_t off)
{
Elf_Scn * s;
Elf_Data * d;
char * rc;
if (elf == 0)
return (0);
#if defined(__APPLE__)
extern const char *elf_macho_str_off(size_t off);
if (elf->ed_kind == ELF_K_MACHO && (ndx == SHN_MACHO || ndx == SHN_MACHO_64))
return (char *)elf_macho_str_off(off);
#endif
if ((s = elf_getscn(elf, ndx)) == 0) {
_elf_seterr(EREQ_STRSCN, 0);
return (0);
}
READLOCKS(elf, s)
if (elf->ed_class == ELFCLASS32) {
Elf32_Shdr* sh = (Elf32_Shdr*)s->s_shdr;
if ((sh == 0) || (sh->sh_type != SHT_STRTAB)) {
_elf_seterr(EREQ_STRSCN, 0);
READUNLOCKS(elf, s)
return (0);
}
} else if (elf->ed_class == ELFCLASS64) {
Elf64_Shdr* sh = (Elf64_Shdr*)s->s_shdr;
if ((sh == 0) || (sh->sh_type != SHT_STRTAB)) {
_elf_seterr(EREQ_STRSCN, 0);
READUNLOCKS(elf, s)
return (0);
}
} else {
_elf_seterr(EREQ_STRSCN, 0);
READUNLOCKS(elf, s)
return (0);
}
d = 0;
if (elf->ed_uflags & ELF_F_LAYOUT) {
while ((d = _elf_locked_getdata(s, d)) != 0) {
if (d->d_buf == 0)
continue;
if ((off >= d->d_off) &&
(off < d->d_off + d->d_size)) {
rc = (char *)d->d_buf + off - d->d_off;
READUNLOCKS(elf, s)
return (rc);
}
}
} else {
size_t sz = 0, j;
while ((d = _elf_locked_getdata(s, d)) != 0) {
if (((j = d->d_align) > 1) && (sz % j != 0)) {
j -= sz % j;
sz += j;
if (off < j)
break;
off -= j;
}
if (d->d_buf != 0) {
if (off < d->d_size) {
rc = (char *)d->d_buf + off;
READUNLOCKS(elf, s)
return (rc);
}
}
sz += d->d_size;
if (off < d->d_size)
break;
off -= d->d_size;
}
}
_elf_seterr(EREQ_STROFF, 0);
READUNLOCKS(elf, s)
return (0);
}