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Run a Tcl script from an encoded file
Using Tcl from C example from a Well House Consultants training course
More on Using Tcl from C [link]
Source code: secret.c Module: T243
#include <stdlib.h>
#include <stdio.h> #include <string.h> #include <tcl.h> /* Run a piece of secured Tcl from a file */ int main(int argc, char ** argv) { FILE * infile; char line[2049]; char * info = NULL; Tcl_Interp *myinterp; int datalength = 0; int llen; int status; int k,j; char holder; /* Read the encoded Tcl from the file into a char string */ infile = fopen(argv[1],"r"); while (fgets(line,2048,infile)) { // Allocate memory for pointer to line just added llen = strlen(line); info = realloc(info,(datalength + llen + 1) * sizeof(char *)); strcpy(info+datalength,line); datalength += llen; } /* printf("%s",info); */ /* Interpret that char string to a real internal Tcl string */ for (k=0; k<datalength; k+=2) { holder = *(info+k); *(info+k) = *(info+k+1); *(info+k+1) = holder; } /* Go run it! */ myinterp = Tcl_CreateInterp(); status = Tcl_Eval(myinterp,info); printf("Phew!\n"); } /* --------------------- Here's how we build and run that -------- munchkin:ta grahamellis$ gcc -o secret secret.c -ltcl -ldl -lm munchkin:ta grahamellis$ ./secret mash number of carriages? 4 number of seats per carriage? 3 That train can take 11 people That train can take 8 cows 3 Phew! munchkin:ta We encoded the file like this: -------------------------------- munchkin:ta dd if=seats of=mash conv=swab munchkin:ta ================================================================== The file used before it was mashed looks like this: ================================================================== proc askuser {prompt} { global rz puts -nonewline "$prompt? " flush stdout set rz [gets stdin] return $rz } proc loader {cars seats {overload 1.4}} { set capacity [expr int($cars * ($seats - 1) * $overload + 0.5)] return $capacity } # hide clever stuff in "proc"s # ----------- here comes the main program ------------- set rz "Loading program for Second Little Western" set nc [askuser "number of carriages"] set spc [askuser "number of seats per carriage"] set capacity [loader $nc $spc] puts [format "That train can take %d people" $capacity] set capacity [loader $nc $spc 1.0] puts [format "That train can take %d cows" $capacity] puts $rz ================================================================== And here is the mashed Tcl file ;-) ================================================================== p or csaukes rp{orpm}t{ lgbolar zp tu sn-noweilen" p$orpm?t" lfsu htsodtu es tzr[ egsts dtni ]r teru nr$ z} rpco oldare{ acsrs aest{ voreolda1 4.}}{ es tacapicyt[ xerpi tn$(acsr* ( s$aest- 1 ) *o$evlrao d +.0)5 ]r teru nc$pacati y} #ihedc elev rtsfu fni" rpcos"# - ----------h re eocem sht eamnip orrgma- ------------ es tzr" oLdani grpgoar mof reSocdnL tilt eeWtsre"n s ten ca[kssure" unbmreo facrraieg"s ]es tps ca[kssure" unbmreo festa sep racrraieg]" es tacapicyt[ oldare$ cn$ ps]cp tu sf[roam tT"ah trtia nac natek% deppoel "c$pacati]y es tacapicyt[ oldare$ cn$ ps c.1]0p tu sf[roam tT"ah trtia nac natek% docsw "c$pacati]y upst$ zr */ Learn about this subject
This module and example are covered on the following public courses:
* Learning to program in Tcl * Tcl Programming * Tcl Programming Also available on on site courses for larger groups Books covering this topic
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This example comes from our "Using Tcl from C" training module. You'll find a description of the topic and some
other closely related examples on the "Using Tcl from C" module index page.
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