elf_strptr(3E)

NAME
     elf_strptr - Makes a string pointer

SYNOPSIS
     cc [flag ...] file ...  -lelf [library ...]

     #include <libelf.h>

     char *elf_strptr(Elf *elf, size_t section, size_t offset);

     #define _LIBELF_XTND_64

     char *elf_strptr(Elf *elf, Elf64_Xword section, Elf64_Xword size_t
     offset);

DESCRIPTION
     This function converts a string section offset to a string pointer.
     elf identifies the file in which the string section resides, and
     section gives the section table index for the strings.  elf_strptr
     normally returns a pointer to a string.  If elf is null, section is
     invalid or is not a section of type SHT_STRTAB, the section data
     cannot be obtained, offset is invalid, or an error occurs, it returns
     a null pointer.

NOTES
     A program may call elf_getdata to retrieve an entire string table
     section.  For some applications, that would be both more efficient and
     more convenient than using elf_strptr.

     The use of a size_t in a 32-bit compile with elf_strptr is
     unfortunate, since that makes it impossible to deal with certain
     object files.  If, when the 32-bit app is compiled, _LIBELF_XTND_64 is
     defined, then the function interface changes to have 64-bit fields.
     If _LIBELF_XTND_64 is defined at compile-time, then instead of linking
     with -lelf, link with -lelf_xtnd.  There is a corresponding
     -ldwarf_xtnd.  It is essential that a 32-bit application compiled with
     _LIBELF_XTND_64 be entirely compiled with _LIBELF_XTND_64 defined.

     Applications that are built as 64-bit applications can ignore
     _LIBELF_XTND_64: it has no effect on them and 64-bit applications
     always link with -lelf, never with -lelf_xtnd.

EXAMPLES
     The following is a prototype for retrieving section names.  The file
     header specifies the section name string table in the e_shstrndx
     member.  The following code loops through the sections, printing their
     names.

          if ((ehdr = elf32_getehdr(elf)) == 0)
          {
               /* handle the error */
               return;
          }
          ndx = ehdr->e_shstrndx;
          scn = 0;
          while ((scn = elf_nextscn(elf, scn)) != 0)
          {
               char *name = 0;
               if ((shdr = elf32_getshdr(scn)) != 0)
                 name = elf_strptr(elf, ndx, (size_t)shdr->sh_name);
               printf("'%s'\n", name? name: "(null)");
          }

SEE ALSO
     elf(3E), elf_getdata(3E), elf_getshdr(3E), elf_xlate(3E)