这段代码有没有问题 auto_ptr<char> ptr_write_buf(new char[write_size]); memset(ptr_write_buf.get(), '\n', write_size);

看起来这段代码中有一个空字符，应该是在调用 `memset` 函数将内存清零时没有正确地指定要填充的值。应该修改代码如下：

memset(ptr_write_buf.get(), 0, write_size);

这样就可以正确地将内存清零了。

相关问题

std::unique_ptr<char[]> pBuf(new char[fsize]); memset(pBuf.get(), 0, fsize); unsigned int read_size = fread(pBuf.get(), 1, fsize, ptr_file); fclose(ptr_file); buf.assign(pBuf.get(), read_size); 这段代码有什么问题，写出修改代码

没有问题，可以修改为：std::unique_ptr<char[]> pBuf(new char[fsize+1]); memset(pBuf.get(), 0, fsize+1); unsigned int read_size = fread(pBuf.get(), 1, fsize, ptr_file); fclose(ptr_file); buf.assign(pBuf.get(), read_size);

if(strcmp(lib->name,"lib.so.6")==0) return; for(int j = 0;j < lib->depcnt; ++j) RelocLibrary(lib->dep[j], mode); Elf64_Sym *sym=NULL; Elf64_Rela *frel=NULL; int relsz=0; char *str=NULL; if(lib->dynInfo[DT_SYMTAB]) sym=(typeof(sym))lib->dynInfo[DT_SYMTAB]->d_un.d_ptr; if(lib->dynInfo[DT_JMPREL]) frel=(typeof(frel))lib->dynInfo[DT_JMPREL]->d_un.d_ptr; if(lib->dynInfo[DT_PLTRELSZ]) relsz=lib->dynInfo[DT_PLTRELSZ]->d_un.d_val/sizeof(Elf64_Rela); if(lib->dynInfo[DT_STRTAB]) str=(char*)lib->dynInfo[DT_STRTAB]->d_un.d_ptr; for(int i=0;i<relsz;++i,++frel){ Elf64_Addr *got=(void*)(lib->addr+frel->r_offset); if(mode == RTLD_LAZY){ *got += lib->addr; continue; } void *result = NULL; for(int j=0;j<lib->depcnt;++j){ void *tmp=symbolLookup(lib->dep[j],&str[sym[ELF64_R_SYM(frel->r_info)].st_name]); if(tmp!=NULL){ result=tmp+frel->r_addend; break; } } *(uint64_t*)(lib->addr+frel->r_offset)=(uint64_t)result; }将这段代码用c语言重新实现

抱歉，我是一个自然语言处理的AI，无法直接生成代码，但我可以提供一个大致的思路供您参考：

首先，需要包含一些头文件，如：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <elf.h>

然后，需要定义一些数据结构，如：

typedef struct {
    char* name;         // 库名
    void* addr;         // 库地址
    int depcnt;         // 依赖库数量
    struct Library** dep;   // 依赖库列表
    Elf64_Dyn** dynInfo;    // 动态信息
} Library;

Library** libraries = NULL;
int libcnt = 0;

接着，需要实现一些函数，如：

void RelocLibrary(Library* lib, int mode) {
    if (strcmp(lib->name, "lib.so.6") == 0) {
        return;
    }
    for (int j = 0; j < lib->depcnt; ++j) {
        RelocLibrary(lib->dep[j], mode);
    }
    Elf64_Sym* sym = NULL;
    Elf64_Rela* frel = NULL;
    int relsz = 0;
    char* str = NULL;
    if (lib->dynInfo[DT_SYMTAB]) {
        sym = (typeof(sym))lib->dynInfo[DT_SYMTAB]->d_un.d_ptr;
    }
    if (lib->dynInfo[DT_JMPREL]) {
        frel = (typeof(frel))lib->dynInfo[DT_JMPREL]->d_un.d_ptr;
    }
    if (lib->dynInfo[DT_PLTRELSZ]) {
        relsz = lib->dynInfo[DT_PLTRELSZ]->d_un.d_val / sizeof(Elf64_Rela);
    }
    if (lib->dynInfo[DT_STRTAB]) {
        str = (char*)lib->dynInfo[DT_STRTAB]->d_un.d_ptr;
    }
    for (int i = 0; i < relsz; ++i, ++frel) {
        Elf64_Addr* got = (void*)(lib->addr + frel->r_offset);
        if (mode == RTLD_LAZY) {
            *got += lib->addr;
            continue;
        }
        void* result = NULL;
        for (int j = 0; j < lib->depcnt; ++j) {
            void* tmp = symbolLookup(lib->dep[j], &str[sym[ELF64_R_SYM(frel->r_info)].st_name]);
            if (tmp != NULL) {
                result = tmp + frel->r_addend;
                break;
            }
        }
        *(uint64_t*)(lib->addr + frel->r_offset) = (uint64_t)result;
    }
}

void* symbolLookup(Library* lib, const char* name) {
    Elf64_Sym* sym = NULL;
    char* str = NULL;
    if (lib->dynInfo[DT_SYMTAB]) {
        sym = (typeof(sym))lib->dynInfo[DT_SYMTAB]->d_un.d_ptr;
    }
    if (lib->dynInfo[DT_STRTAB]) {
        str = (char*)lib->dynInfo[DT_STRTAB]->d_un.d_ptr;
    }
    for (int i = 0; i < lib->dynInfo[DT_PLTRELSZ]->d_un.d_val / sizeof(Elf64_Rela); ++i) {
        if (ELF64_ST_TYPE(sym[i].st_info) != STT_FUNC) {
            continue;
        }
        if (strcmp(&str[sym[i].st_name], name) == 0) {
            return (void*)(lib->addr + sym[i].st_value);
        }
    }
    return NULL;
}

Library* loadLibrary(const char* name, int mode) {
    char buf[256];
    Library* lib = (Library*)malloc(sizeof(Library));
    lib->name = strdup(name);
    snprintf(buf, sizeof(buf), "/usr/lib/%s", name);
    FILE* fp = fopen(buf, "rb");
    if (fp == NULL) {
        free(lib);
        return NULL;
    }
    fseek(fp, 0, SEEK_END);
    size_t size = ftell(fp);
    fseek(fp, 0, SEEK_SET);
    void* addr = malloc(size);
    fread(addr, 1, size, fp);
    fclose(fp);
    Elf64_Ehdr* ehdr = (Elf64_Ehdr*)addr;
    Elf64_Phdr* phdr = (Elf64_Phdr*)((char*)ehdr + ehdr->e_phoff);
    for (int i = 0; i < ehdr->e_phnum; ++i) {
        if (phdr[i].p_type == PT_LOAD) {
            memcpy((void*)phdr[i].p_vaddr, (void*)((char*)addr + phdr[i].p_offset), phdr[i].p_filesz);
            memset((void*)(phdr[i].p_vaddr + phdr[i].p_filesz), 0, phdr[i].p_memsz - phdr[i].p_filesz);
        }
    }
    Elf64_Dyn* dyn = (Elf64_Dyn*)((char*)ehdr + ehdr->e_dynamic);
    lib->dynInfo = (Elf64_Dyn**)malloc(sizeof(Elf64_Dyn*) * DT_NUM);
    memset(lib->dynInfo, 0, sizeof(Elf64_Dyn*) * DT_NUM);
    while (dyn->d_tag != DT_NULL) {
        if (dyn->d_tag < DT_NUM) {
            lib->dynInfo[dyn->d_tag] = dyn;
        }
        dyn++;
    }
    lib->addr = addr;
    lib->depcnt = 0;
    lib->dep = NULL;
    if (lib->dynInfo[DT_NEEDED]) {
        char* str = (char*)lib->dynInfo[DT_STRTAB]->d_un.d_ptr;
        char* ptr = (char*)lib->dynInfo[DT_NEEDED]->d_un.d_ptr;
        while (*ptr) {
            char* depname = ptr;
            ptr += strlen(depname) + 1;
            if (mode == RTLD_LAZY) {
                if (strcmp(depname, "libpthread.so.0") == 0 || strcmp(depname, "libc.so.6") == 0) {
                    continue;
                }
            }
            if (strcmp(depname, lib->name) == 0) {
                continue;
            }
            Library* dep = loadLibrary(depname, mode);
            if (dep == NULL) {
                fprintf(stderr, "cannot load library '%s'\n", depname);
                exit(1);
            }
            lib->dep = (Library**)realloc(lib->dep, sizeof(Library*) * (lib->depcnt + 1));
            lib->dep[lib->depcnt] = dep;
            lib->depcnt++;
        }
    }
    libraries = (Library**)realloc(libraries, sizeof(Library*) * (libcnt + 1));
    libraries[libcnt] = lib;
    libcnt++;
    return lib;
}

void unloadLibrary(Library* lib) {
    for (int i = 0; i < lib->depcnt; ++i) {
        unloadLibrary(lib->dep[i]);
    }
    free(lib->dep);
    free(lib->dynInfo);
    free(lib->name);
    free(lib->addr);
    free(lib);
}

最后，可以在主函数中调用这些函数，如：

int main() {
    Library* lib = loadLibrary("libtest.so", RTLD_NOW);
    RelocLibrary(lib, RTLD_NOW);
    void (*func)() = symbolLookup(lib, "test");
    if (func != NULL) {
        func();
    }
    unloadLibrary(lib);
    return 0;
}

当然，这只是一个大致的实现思路，具体实现还需要根据需求进行适当的修改和调整。