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FreeBSD 11.0 - man page for dwarf_get_str (freebsd section 3)

DWARF_GET_STR(3)					   BSD Library Functions Manual 					  DWARF_GET_STR(3)

dwarf_get_str -- retrieve a string from the DWARF string section
DWARF Access Library (libdwarf, -ldwarf)
#include <libdwarf.h> int dwarf_get_str(Dwarf_Debug dbg, Dwarf_Off offset, char **string, Dwarf_Signed *len, Dwarf_Error *err);
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.
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.
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.
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));
dwarf(3), dwarf_init(3)
April 3, 2011 BSD