5
我有調用getline()的功能，其內容從一個標準的文本文件行。這些行以\r\n結尾，因爲這是規範要求的，因爲它是VCARD文件的「互聯網標準」。與函數getline Valgrind的捐贈錯誤（）
不管怎樣，我通過運行Valgrind的在openSUSE 11.3這個寶貝了最新的GCC和Valgrind的版本;沒有錯誤。然而，對於沒有關聯到這個問題的原因，我切換到發行版備份軌道4（Ubuntu的基礎），現在我得到一噸Valgrind的錯誤：
==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)
我特別不知道是什麼線涉及
--21536-- Warning: DWARF2 CFI reader: unhandled DW_OP_ opcode 0x55
的意思。自從我改變發行版以來，這些都是新的。
無論如何，僅供參考，這裏是我的問題的功能：
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;
}
...和虛擬功能的測試數據發送給它：
int main() {
FILE* fp = fopen ("test.vcf", "r");
char * buff;
getUnfolded (fp, &buff);
}
的test.vcf文件只是一個簡單的文本文件真的
任何幫助將是驚人的。
這是非常有趣的關於谷歌的事情：P去告訴你我沒有如果這是第一個結果，那麼運氣會使用Google搜索這個問題。 是的，我在這個新的主機上重新編譯過多次，並且源代碼沒有改變... test.vcf文件使用了正確的EOL CRLF ...這是一個令人煩惱的問題！ – araisbec 2011-02-23 02:55:31
如果我沒有記錯的話，'dwarf2 opcode'錯誤可能只是你轉向比你使用的編譯器更早的valgrind版本，並且可以安全地忽略。關於你的錯誤：你調用'strlen（隊列）'。如果該行比'lineSize'更長，會發生什麼？如果你得出的結論是代碼是可以的，你可以生成一個抑制文件來繼續你的生活。 – Borealid 2011-02-23 03:52:47
感謝您的回覆，很高興理解爲什麼valgrind在我身上噴出廢話，毫無意義！如果你知道如何抑制這些錯誤，我會很有興趣去學習。我不知道如何解決你所指的錯誤。在我的理解中，strlen（隊列）行被調用，如果從上次調用函數開始隊列中有某些內容。我一直收到類似「比較中使用的未初始化變量」這樣的錯誤，因爲我的變量已經在條件語句中初始化了（在任何情況下），我也不知道如何去除這些變量。 – araisbec 2011-02-23 04:04:15