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57 lines
1.3 KiB
57 lines
1.3 KiB
// Copyright 2015 CoreOS, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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// +build linux
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package dlopen
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// #include <string.h>
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// #include <stdlib.h>
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//
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// int
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// my_strlen(void *f, const char *s)
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// {
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// size_t (*strlen)(const char *);
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//
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// strlen = (size_t (*)(const char *))f;
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// return strlen(s);
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// }
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import "C"
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import (
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"fmt"
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"unsafe"
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)
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func strlen(libs []string, s string) (int, error) {
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h, err := GetHandle(libs)
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if err != nil {
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return -1, fmt.Errorf(`couldn't get a handle to the library: %v`, err)
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}
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defer h.Close()
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f := "strlen"
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cs := C.CString(s)
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defer C.free(unsafe.Pointer(cs))
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strlen, err := h.GetSymbolPointer(f)
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if err != nil {
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return -1, fmt.Errorf(`couldn't get symbol %q: %v`, f, err)
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}
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len := C.my_strlen(strlen, cs)
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return int(len), nil
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}
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