int s_parse_symbol()

in source/posix/system_info.c [251:303]

• 42 lines of code
• 14 McCabe index (conditional complexity)

int s_parse_symbol(const char *symbol, void *addr, struct aws_stack_frame_info *frame) {
    /* symbols look like: <exe-or-shared-lib>(<function>+<addr>) [0x<addr>]
     *                or: <exe-or-shared-lib> [0x<addr>]
     *                or: [0x<addr>]
     */
    (void)addr;
    const char *open_paren = strstr(symbol, "(");
    const char *close_paren = strstr(symbol, ")");
    const char *exe_end = open_paren;
    /* there may not be a function in parens, or parens at all */
    if (open_paren == NULL || close_paren == NULL) {
        exe_end = strstr(symbol, "[");
        if (!exe_end) {
            return AWS_OP_ERR;
        }
        /* if exe_end == symbol, there's no exe */
        if (exe_end != symbol) {
            exe_end -= 1;
        }
    }

    ptrdiff_t exe_len = exe_end - symbol;
    if (exe_len > 0) {
        strncpy(frame->exe, symbol, exe_len);
    }
    s_whitelist_chars(frame->exe);

    long function_len = (open_paren && close_paren) ? close_paren - open_paren - 1 : 0;
    if (function_len > 0) { /* dynamic symbol was found */
        /* there might be (<function>+<addr>) or just (<function>) */
        const char *function_start = open_paren + 1;
        const char *plus = strstr(function_start, "+");
        const char *function_end = (plus) ? plus : close_paren;
        if (function_end > function_start) {
            function_len = function_end - function_start;
            strncpy(frame->function, function_start, function_len);
        } else if (plus) {
            long addr_len = close_paren - plus - 1;
            strncpy(frame->addr, plus + 1, addr_len);
        }
    }
    if (frame->addr[0] == 0) {
        /* use the address in []'s, since it's all we have */
        const char *addr_start = strstr(exe_end, "[") + 1;
        char *addr_end = strstr(addr_start, "]");
        if (!addr_end) {
            return AWS_OP_ERR;
        }
        strncpy(frame->addr, addr_start, addr_end - addr_start);
    }

    return AWS_OP_SUCCESS;
}