我有一个调用getline()的函数，它从标准文本文件中读取行。这些行以\r\n结尾，因为这是规范所要求的，因为它是VCARD文件的“互联网标准”。
无论如何，我在OpenSUSE 11.3上通过Valgrind运行这个宝贝，使用最新的GCC和Valgrind版本;没有错误。但是，由于与此问题无关的原因，我将发行版转换为Back Track 4（基于Ubuntu），现在我得到了一公吨的Valgrind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)
我特别不知道线条是指什么
--21536-- Warning: DWARF2 CFI reader: unhandled DW_OP_ opcode 0x55
的意思。这些都是新的，因为我改变了发行版。
无论如何，作为参考，这是我的问题：
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;
}
...以及向其发送测试数据的虚拟函数：
int main () {
FILE* fp = fopen ("test.vcf", "r");
char * buff;
getUnfolded (fp, &buff);
}
test.vcf文件只是一个简单的文本文件
任何帮助都会很棒。
答案 0 :(得分：5)
您正在使用的valgrind版本已过时，因此不会抑制正确的输出。这些错误仍然存在，因为它们在系统代码中，它们只是被抑制。
您需要手动安装最新版本的valgrind
这是我用过的论坛帖子