error: stray ‘\302’ in program

Make and meet this error!

$ gcc -g -Wall -o test callback_simple.c
callback_simple.c:7:1: error: stray ‘\302’ in program
callback_simple.c:7:1: error: stray ‘\240’ in program
callback_simple.c:9:1: error: stray ‘\302’ in program
callback_simple.c:9:1: error: stray ‘\240’ in program
callback_simple.c: In function ‘sig_handler’:
callback_simple.c:13:5: error: stray ‘\302’ in program
callback_simple.c:13:5: error: stray ‘\240’ in program

\302 is the octal representation of the UTF-8 sequence 0xC2

You have invalid chars in the source. If you don't have any valid non ascii chars in your source, maybe in a double quoted string literal, you can simply convert your file back to ascii with the following command:

tr -cd '\11\12\15\40-\176' < old.c > new.c

It works!

Address out of bounds 错误分析

遇到Address out of bounds 错误，原来是数组的大小超过了栈的大小！

---

栈大小是有限的

VC默认的分配给栈的空间是1MB～2MB,体积比较大的对象不适合在栈中分配.特别
要注意递归函数中最好不要使用栈对象,因为随着递归调用深度的增加,所需的栈
空间也会线性增加,当所需栈空间不够时,便会导致栈溢出,就会产生运行时错误.

如果真的需要的话,在数组定义前面加上static,将数组分配在静态内存中,静态内存相比起堆栈要大很多的.

或者直接把这个数组定义成全局的,这样也会将其分配在静态内存.

vc6/7 默认1M
不过这个可以修改的Project->Setting->Link，在Category   中选中Output，然后在Reserve中设定堆栈的最大值和commit   

---

看一下stack是否被限制，如果是unlimited，那么栈的大小只受内存大小限制，当然还有一个2G的上限。至于是否能达到2G上限，答案是否定的，因为除了栈，程序还有别的地方会用到内存。不过linux在某种方式下可以用到最高64G的内存，不知道栈是否也可以突破2G的限制?

Linux下也是可以修改的：

先用命令 ulimit -a 看看默认的stack size

user@ubuntu-64bit:~/mysql_study$ ulimit -a

core file size (blocks, -c) 0

data seg size (kbytes, -d) unlimited

scheduling priority (-e) 0

file size (blocks, -f) unlimited

pending signals (-i) 15821

max locked memory (kbytes, -l) 64

max memory size (kbytes, -m) unlimited

open files (-n) 1024

pipe size (512 bytes, -p) 8

POSIX message queues (bytes, -q) 819200

real-time priority (-r) 0

stack size (kbytes, -s) 8192

cpu time (seconds, -t) unlimited

max user processes (-u) 15821

virtual memory (kbytes, -v) unlimited

file locks (-x) unlimited

然后再用命令将其修改，这里，改大一点做测试。

user@ubuntu-64bit:~/mysql_study$ ulimit -s 9999999

改了后发现‘Address out of bounds’ 的错误消失, oh yeah.

用动态分配, malloc free 要好一些~~~~

the vim cscope easy tutorial

The following steps to help you to set up cscope easily.

1. install cscope:

user@ubuntu-64bit:~$ sudo apt-get install cscope

2. Download the cscope_maps.vim file, put it to $HOME/.vim/plugin directory:

user@ubuntu-64bit:~$ mv Desktop/cscope_maps.vim .vim/plugin/  

3. Try setting the $CSCOPE_DB environment variable to point to a Cscope database you create:

    find /my/project/dir -name '*.c' -o -name '*.h' > /foo/cscope.files

   Then run Cscope in the same directory as the cscope.files file (or use 'cscope -i /foo/cscope.files'), then set and export the $CSCOPE_DB variable, pointing it to            the cscope.out file that results):

    cd /foo
    cscope -b 

    CSCOPE_DB=/foo/cscope.out; export CSCOPE_DB    

---

add the commands:

    " The following maps all invoke one of the following cscope search types:

    "

    " 's' symbol: find all references to the token under cursor

    " 'g' global: find global definition(s) of the token under cursor

    " 'c' calls: find all calls to the function name under cursor

    " 't' text: find all instances of the text under cursor

    " 'e' egrep: egrep search for the word under cursor

    " 'f' file: open the filename under cursor

    " 'i' includes: find files that include the filename under cursor

    " 'd' called: find functions that function under cursor calls

    " To do the first type of search, hit 'CTRL-\', followed by one of the

    " cscope search types above (s,g,c,t,e,f,i,d).