NAME

dwarf_get_str —

retrieve a string from the DWARF string section

LIBRARY

DWARF Access Library (libdwarf, -ldwarf)

SYNOPSIS

#include <libdwarf.h>

int
dwarf_get_str(Dwarf_Debug dbg, Dwarf_Off offset, char **string, Dwarf_Signed *len, Dwarf_Error *err);

DESCRIPTION

Function dwarf_get_str() retrieves a NUL-terminated string from the DWARF string section “.debug_str”.

Argument dbg should reference a DWARF debug context allocated using dwarf_init(3).

Argument offset should be an offset, relative to the “.debug_str” section, specifying the start of the desired string.

Argument string should point to a location which will hold a returned pointer to a NUL-terminated string.

Argument len should point to a location which will hold the length of the returned string. The returned length does not include the space needed for the NUL-terminator.

If argument err is not NULL, it will be used to store error information in case of an error.

RETURN VALUES

Function dwarf_get_str() returns DW_DLV_OK when it succeeds. It returns DW_DLV_NO_ENTRY if there is no “.debug_str” section associated with the specified debugging context, or if the provided offset offset is at the very end of “.debug_str” section. In case of an error, it returns DW_DLV_ERROR and sets the argument err.

EXAMPLES

To retrieve all the strings in the DWARF string section, use:

Dwarf_Debug dbg;
Dwarf_Off offset;
Dwarf_Signed len;
Dwarf_Error de;
char *str;
int ret

offset = 0;
while ((ret = dwarf_get_str(dbg, offset, &str, &len, &de)) ==
	DW_DLV_OK) {
	/* .. Use the retrieved string. .. */
	offset += len + 1; /* Account for the terminating NUL. */
}

if (ret == DW_DLV_ERROR)
	warnx("dwarf_get_str: %s", dwarf_errmsg(de));

ERRORS

Function dwarf_get_str() can fail with:

[DW_DLE_ARGUMENT]: One of the arguments dbg, string or len was NULL.
[DW_DLE_ARGUMENT]: Argument offset was out of range.
[DW_DLE_NO_ENTRY]: The debugging context dbg did not contain a “.debug_str” string section.
[DW_DLE_NO_ENTRY]: Argument offset was at the very end of the “.debug_str” section.