c programming

Colored printf messages in Linux

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If you have ever wanted to have colored printf statements for easier debugging - look no further

printf("%c[%d;%dmColor Me!%c[%dm\n",27,1,33,27,0);

Starting with the parameter - 27, this initiates the coloring. The rest of the parameters are (attribute);(fore color);(background color).


Text attributes
0 All attributes off
1 Bold on
4 Underscore (on monochrome display adapter only)
5 Blink on
7 Reverse video on
8 Concealed on

C Objects and Finding Unresolved Symbols

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One of the issues when cross-compiling is time. As a developer I find that it really sucks after you waited for a program to compile, installed it and executed it to only find out.. its broken.

Before transfering it and installing it, there are two easy ways to see if there are undefined symbols: nm and readelf.

nm produces something like the following:

  1. 000002dc T DNP3ObjInit
  2.          U DynamicPreprocessorFatalMessage
  3.          U __ctype_b
  4.          U _dpd
  5.          U calloc
  6.          U strcmp
  7.          U strtok_r
  8.  
  9. dnp3_map.o:
  10. 00000000 t $a
  11. 00000058 t $a
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