Test libcorkscrew's ELF symbol table decoder too.

#include <corkscrew/backtrace.h>

#include <corkscrew/symbol_table.h>

#include <stdio.h>

#include <stdlib.h>

    char line[MAX_BACKTRACE_LINE_LENGTH];

    format_backtrace_line(i, &frames[i], &backtrace_symbols[i],

                          line, MAX_BACKTRACE_LINE_LENGTH);

    if (backtrace_symbols[i].symbol_name != NULL) {

      // get_backtrace_symbols found the symbol's name with dladdr(3).

      fprintf(stderr, "  %s\n", line);

    } else {

      // We don't have a symbol. Maybe this is a static symbol, and

      // we can look it up?

      symbol_table_t* symbols = NULL;

      if (backtrace_symbols[i].map_name != NULL) {

        symbols = load_symbol_table(backtrace_symbols[i].map_name);

      }

      const symbol_t* symbol = NULL;

      if (symbols != NULL) {

        symbol = find_symbol(symbols, frames[i].absolute_pc);

      }

      if (symbol != NULL) {

        uintptr_t offset = frames[i].absolute_pc - symbol->start;

        fprintf(stderr, "  %s (%s%+d)\n", line, symbol->name, offset);

      } else {

        fprintf(stderr, "  %s (\?\?\?)\n", line);

      }

      free(symbols);

    }

  }

  free_backtrace_symbols(backtrace_symbols, frame_count);