5
我有调用getline()的功能，其内容从一个标准的文本文件行。这些行以\r\n结尾，因为这是规范要求的，因为它是VCARD文件的“互联网标准”。与函数getline Valgrind的捐赠错误（）
不管怎样，我通过运行Valgrind的在openSUSE 11.3这个宝贝了最新的GCC和Valgrind的版本;没有错误。然而，对于没有关联到这个问题的原因，我切换到发行版备份轨道4（Ubuntu的基础），现在我得到一吨Valgrind的错误：
==21536== Conditional jump or move depends on uninitialised value(s)
==21536== at 0x40164A1: (within /lib/ld-2.11.1.so)
==21536== by 0x4007C04: (within /lib/ld-2.11.1.so)
==21536== by 0x4002A2C: (within /lib/ld-2.11.1.so)
==21536== by 0x4014206: (within /lib/ld-2.11.1.so)
==21536== by 0x4000C6C: (within /lib/ld-2.11.1.so)
==21536== by 0x4000856: (within /lib/ld-2.11.1.so)
==21536==
==21536== Conditional jump or move depends on uninitialised value(s)
==21536== at 0x40164AC: (within /lib/ld-2.11.1.so)
==21536== by 0x4007C04: (within /lib/ld-2.11.1.so)
==21536== by 0x4002A2C: (within /lib/ld-2.11.1.so)
==21536== by 0x4014206: (within /lib/ld-2.11.1.so)
==21536== by 0x4000C6C: (within /lib/ld-2.11.1.so)
==21536== by 0x4000856: (within /lib/ld-2.11.1.so)
--21536-- Warning: DWARF2 CFI reader: unhandled DW_OP_ opcode 0x55
--21536-- Warning: DWARF2 CFI reader: unhandled DW_OP_ opcode 0x55
--21536-- DWARF2 CFI reader: unhandled CFI instruction 0:10
--21536-- DWARF2 CFI reader: unhandled CFI instruction 0:10
--21536-- DWARF2 CFI reader: unhandled CFI instruction 0:10
--21536-- DWARF2 CFI reader: unhandled CFI instruction 0:10
--21536-- DWARF2 CFI reader: unhandled CFI instruction 0:10
--21536-- DWARF2 CFI reader: unhandled CFI instruction 0:10
--21536-- DWARF2 CFI reader: unhandled CFI instruction 0:10
==21536==
==21536== Conditional jump or move depends on uninitialised value(s)
==21536== at 0x400B217: (within /lib/ld-2.11.1.so)
==21536== by 0x40031D0: (within /lib/ld-2.11.1.so)
==21536== by 0x4014206: (within /lib/ld-2.11.1.so)
==21536== by 0x4000C6C: (within /lib/ld-2.11.1.so)
==21536== by 0x4000856: (within /lib/ld-2.11.1.so)
==21536==
==21536== Conditional jump or move depends on uninitialised value(s)
==21536== at 0x400AF0F: (within /lib/ld-2.11.1.so)
==21536== by 0x40031D0: (within /lib/ld-2.11.1.so)
==21536== by 0x4014206: (within /lib/ld-2.11.1.so)
==21536== by 0x4000C6C: (within /lib/ld-2.11.1.so)
==21536== by 0x4000856: (within /lib/ld-2.11.1.so)
==21536==
==21536== Conditional jump or move depends on uninitialised value(s)
==21536== at 0x400B27A: (within /lib/ld-2.11.1.so)
==21536== by 0x40031D0: (within /lib/ld-2.11.1.so)
==21536== by 0x4014206: (within /lib/ld-2.11.1.so)
==21536== by 0x4000C6C: (within /lib/ld-2.11.1.so)
==21536== by 0x4000856: (within /lib/ld-2.11.1.so)
==21536==
==21536== Conditional jump or move depends on uninitialised value(s)
==21536== at 0x400A5DE: (within /lib/ld-2.11.1.so)
==21536== by 0x40030FE: (within /lib/ld-2.11.1.so)
==21536== by 0x4014206: (within /lib/ld-2.11.1.so)
==21536== by 0x4000C6C: (within /lib/ld-2.11.1.so)
==21536== by 0x4000856: (within /lib/ld-2.11.1.so)
==21536==
==21536== Conditional jump or move depends on uninitialised value(s)
==21536== at 0x400A5E6: (within /lib/ld-2.11.1.so)
==21536== by 0x40030FE: (within /lib/ld-2.11.1.so)
==21536== by 0x4014206: (within /lib/ld-2.11.1.so)
==21536== by 0x4000C6C: (within /lib/ld-2.11.1.so)
==21536== by 0x4000856: (within /lib/ld-2.11.1.so)
==21536==
==21536== Conditional jump or move depends on uninitialised value(s)
==21536== at 0x400AF0F: (within /lib/ld-2.11.1.so)
==21536== by 0x40030FE: (within /lib/ld-2.11.1.so)
==21536== by 0x4014206: (within /lib/ld-2.11.1.so)
==21536== by 0x4000C6C: (within /lib/ld-2.11.1.so)
==21536== by 0x4000856: (within /lib/ld-2.11.1.so)
==21536==
==21536== Invalid read of size 8
==21536== at 0x40B4785: (within /lib/tls/i686/cmov/libc-2.11.1.so)
==21536== by 0x8049EFB: main (vcutil.c:496)
==21536== Address 0x419d1b0 is 8 bytes before a block of size 120 alloc'd
==21536== at 0x4025D2E: malloc (vg_replace_malloc.c:207)
==21536== by 0x409DF9D: getdelim (in /lib/tls/i686/cmov/libc-2.11.1.so)
==21536== by 0x408F3A2: getline (in /lib/tls/i686/cmov/libc-2.11.1.so)
==21536== by 0x804947C: getUnfolded (vcutil.c:299)
==21536== by 0x8049EFB: main (vcutil.c:496)
==21536==
==21536== Conditional jump or move depends on uninitialised value(s)
==21536== at 0x40B47AD: (within /lib/tls/i686/cmov/libc-2.11.1.so)
==21536== by 0x8049EFB: main (vcutil.c:496)
==21536==
==21536== Conditional jump or move depends on uninitialised value(s)
==21536== at 0x8049524: getUnfolded (vcutil.c:307)
==21536== by 0x8049EFB: main (vcutil.c:496)
我特别不知道是什么线涉及
--21536-- Warning: DWARF2 CFI reader: unhandled DW_OP_ opcode 0x55
的意思。自从我改变发行版以来，这些都是新的。
无论如何，仅供参考，这里是我的问题的功能：
VcStatus getUnfolded (FILE *const vcf, char **const buff) {
//int const buffSize = 30;
size_t lineSize = 0;
int done = 0; //Set to one if the next line checked does not entail unfolding
static char* queue = NULL; //A queue to store the next line read in
static int lineNum = 0;
char* buffer = NULL; //The dynamic memory that will be linked to buf
int valid_line = 0; //Set to one if the line contains characters other then whitespace
char* temp; //Used to point to the location of \r\n in the buffer
VcStatus error; //Initialize VcStatus with appropriate values
error.code = OK;
error.linefrom = lineNum;
error.lineto = 0;
//Special case for resetting getUnfolded()
if (vcf == NULL){
lineNum = 0;
if (queue != NULL) queue = NULL;
error.linefrom = 0;
error.lineto = 0;
return error;
}
//Copies any string contained in queue from last time into buffer
if (queue != NULL) {
buffer = malloc (strlen (queue)+1);
strcpy (buffer, queue);
strcpy (queue, "");
}
//If the end of file has been reached, last line is returned.
if (feof (vcf) != 0) {
queue = NULL;
lineNum += 1;
if (buffer != NULL) {
if (strcmp (buffer, "") != 0)*buff = buffer;
}
else *buff = NULL;
return error;
}
while (done == 0) {
//Gets a new line from the vcf file, and returns null if there is no more data to be returned
getline (&queue, &lineSize, vcf);
if (ferror(vcf) != 0) {
error.code = IOERR;
return error;
}
//Sets valid_line to 1 if the line read in contains any characters other then whitespace
for (int i = 0; i < strlen (queue); i++){
if (queue[i] != '\r' && queue[i] != '\n' && queue[i] != ' ' && queue[i] != '\t') valid_line = 1;
}
if (feof (vcf) && valid_line == 0) {
queue = NULL;
break;
}
if (valid_line == 1){
//Finds the 'internet standard' newline and replaces it with a null terminator
temp = strstr (queue, "\r\n");
if (temp != NULL) strcpy (temp, "\0");
//Sets the buffer equal to contents of queue and resets queue if buffer is empty
if (buffer == NULL) {
buffer = malloc (strlen (queue)+1);
lineNum = lineNum + 1;
strcpy (buffer, queue);
strcpy (queue, "");
//Checks for leading whitespace to indicate a folded line, and unfolds
}else if (queue [0] == ' ' || queue [0] == '\t') {
lineNum = lineNum + 1;
buffer = realloc (buffer, strlen (buffer)+strlen (queue)+2);
strcat (buffer, queue+1);
strcpy (queue, "");
//If both conditions above are false, buffer contains the next valid line
}else{
error.lineto = lineNum;
lineNum += 1;
done = 1;
}
}
}
*buff = buffer;
return error;
}
...和虚拟功能的测试数据发送给它：
int main() {
FILE* fp = fopen ("test.vcf", "r");
char * buff;
getUnfolded (fp, &buff);
}
的test.vcf文件只是一个简单的文本文件真的
任何帮助将是惊人的。
这是非常有趣的关于谷歌的事情：P去告诉你我没有如果这是第一个结果，那么运气会使用Google搜索这个问题。 是的，我在这个新的主机上重新编译过多次，并且源代码没有改变... test.vcf文件使用了正确的EOL CRLF ...这是一个令人烦恼的问题！ – araisbec 2011-02-23 02:55:31
如果我没有记错的话，'dwarf2 opcode'错误可能只是你转向比你使用的编译器更早的valgrind版本，并且可以安全地忽略。关于你的错误：你调用'strlen（队列）'。如果该行比'lineSize'更长，会发生什么？如果你得出的结论是代码是可以的，你可以生成一个抑制文件来继续你的生活。 – Borealid 2011-02-23 03:52:47
感谢您的回复，很高兴理解为什么valgrind在我身上喷出废话，毫无意义！如果你知道如何抑制这些错误，我会很有兴趣去学习。我不知道如何解决你所指的错误。在我的理解中，strlen（队列）行被调用，如果从上次调用函数开始队列中有某些内容。我一直收到类似“比较中使用的未初始化变量”这样的错误，因为我的变量已经在条件语句中初始化了（在任何情况下），我也不知道如何去除这些变量。 – araisbec 2011-02-23 04:04:15