Little Lib of C++ functions

libtools

/* libtools.cpp - library of C++ procedures */

#include <cstdio>
#include <cstring>
#include <cstdlib>
#include <cctype>

#define MAX_NAME 255 /* maximum length of program or file name */

static char prog_name[MAX_NAME+1]; /* used in error messages */

/* savename - record a program name for error messages */

void savename(const char* name) {

if (strlen(name) <= MAX_NAME)
strcpy(prog_name, name);
}

/* fatal - print message and die */

int fatal(const char* msg) {

if(prog_name[0] != '\0')
fprintf(stderr, "%s: ", prog_name);

fprintf(stderr, "%s\n", msg);

exit(1);
}

/* fatalf - format message, print it and die */

int fatalf(const char *msg, const char *val) {
     
   if(prog_name[0] != '\0') 
     fprintf(stderr, "%s: ", prog_name);

   fprintf(stderr, msg, val);
   putc('\n', stderr);
   exit(1);
}

/* ckopen - open file; check for success */

FILE *ckopen(const char *name, const char *mode) {

    
    FILE *fp;

    if((fp = fopen(name, mode)) == NULL)
      fatalf("Cannot open %s. ", name);

    return(fp);
}

/* ckalloc - allocate space; check for success */

void *ckalloc(int amount) {

  void *p;
  if((p = malloc( (unsigned) amount)) == NULL)
      fatal("Run out of memory.");

  return(p);
}

/* strsame - tell whether two strings are identical */

int strsame(char *s, char *t) {

 return(strcmp(s, t) == 0);

}

/* strsave - save string s somewhere ; return address */

char *strsave(char *s) {
  void *p;

  p = ckalloc(strlen(s)+1);  /* +1 to hold \0 */
  return(strcpy((char *)p,s));
}
 


/*****************/
/*               */
/*   main        */
/*               */
/*****************/

int main(int argc, const char *argv[]) {

savename("libtools");

int c;
FILE *fp = stdin;

if( argc > 1)
fp = fopen(argv[1], "r");
while((c = getc(fp)) != EOF)
putc(c, stdout);

printf("Program: %s completed!\n", prog_name);
return 0;
}