nrnbinstr.cpp

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// prints the first "x:.../activate.bat" in the first 10000 bytes of
// the binary file (second arg). Characters may or may not be 16 bit
// integers (ignore '\0')
// (return 0 if found, 1 if not found or error)

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>

int main(int argc, const char** argv) {
  if (argc != 3) {
    fprintf(stderr, "Usage: nrnbinstr \"pattern\" \"binaryfile\"\n");
    return 1;
  }
  const char* pat = argv[1];
  const char* fname = argv[2];

  FILE* f = fopen(fname, "rb");
  if (!f) {
    fprintf(stderr, "Could not open %s\n", fname);
    return 1;
  }

  char* buf = new char[10000];
  int size = fread(buf, sizeof(char), 10000, f);
  fclose(f);

  int c;
  char* result = new char[10000];
  int lenpat = strlen(pat);
  int ifirst=0, ipat=0, iresult=0;
  int icolon=0;
  for (int i=0; i < size-1; ++i) {
    c = buf[i];
    if (c == 0 && buf[i+1] != 0) { continue; } // ignore single '\0'
    if (isprint(c)) {
      if (c == ':' && iresult > 0) {
        icolon = iresult - 1; // must be single character drive letter
      }
      result[iresult++] = c;
      if (c == pat[ipat]) {
        ipat++;
        if (ipat == lenpat) {
          result[iresult] = '\0';
          printf("%s\n", result + icolon);
          return 0;
        } 
      }else if (ipat > 0) {
        ipat = 0;
      }
    }else{
      icolon = 0;
      iresult = 0;
      ipat = 0;
      ifirst = i+1;
    }
  }
  return 1;
}