str.c

Go to the documentation of this file.

#include "str.h"
#include "stralloc.h"
 
unsigned int str_copy(char *s,const char *t)
{
  int len;
 
  len = 0;
  for (;;) {
    if (!(*s = *t)) { return len; } ++s; ++t; ++len; 
    if (!(*s = *t)) { return len; } ++s; ++t; ++len;
    if (!(*s = *t)) { return len; } ++s; ++t; ++len;
    if (!(*s = *t)) { return len; } ++s; ++t; ++len;
  }
}
 
unsigned int str_copyb(char *s,const char *t,unsigned int max)
{
  int len;
 
  len = 0;
 
  while (max-- > 0) {
    if (!(*s = *t)) { return len; } ++s; ++t; ++len;
    if (!(*s = *t)) { return len; } ++s; ++t; ++len;
    if (!(*s = *t)) { return len; } ++s; ++t; ++len;
    if (!(*s = *t)) { return len; } ++s; ++t; ++len;
  }
 
  return len;
}
 
int str_diff(const char *s,const char *t)
{
  char x;
 
  for (;;) {
    x = *s; if (x != *t) { break; } if (!x) { break; } ++s; ++t;
    x = *s; if (x != *t) { break; } if (!x) { break; } ++s; ++t;
    x = *s; if (x != *t) { break; } if (!x) { break; } ++s; ++t;
    x = *s; if (x != *t) { break; } if (!x) { break; } ++s; ++t;
  }
  return ((int)(unsigned int)(unsigned char) x)
       - ((int)(unsigned int)(unsigned char) *t);
}
 
int str_diffn(const char *s,const char *t,unsigned int len)
{
  char x;
 
  for (;;) {
    if (!len--) { return 0; } x = *s; if (x != *t) { break; } if (!x) { break; } ++s; ++t;
    if (!len--) { return 0; } x = *s; if (x != *t) { break; } if (!x) { break; } ++s; ++t;
    if (!len--) { return 0; } x = *s; if (x != *t) { break; } if (!x) { break; } ++s; ++t;
    if (!len--) { return 0; } x = *s; if (x != *t) { break; } if (!x) { break; } ++s; ++t;
  }
  return ((int)(unsigned int)(unsigned char) x)
       - ((int)(unsigned int)(unsigned char) *t);
}
 
unsigned int str_len(const char *s)
{
  const char *t;
 
  t = s;
  for (;;) {
    if (!*t) { return t - s; } ++t;
    if (!*t) { return t - s; } ++t;
    if (!*t) { return t - s; } ++t;
    if (!*t) { return t - s; } ++t;
  }
}
 
unsigned int str_chr(const char *s,int c)
{
  char ch;
  const char *t;
 
  ch = c;
  t = s;
  for (;;) {
    if (!*t) { break; } if (*t == ch) { break; } ++t;
    if (!*t) { break; } if (*t == ch) { break; } ++t;
    if (!*t) { break; } if (*t == ch) { break; } ++t;
    if (!*t) { break; } if (*t == ch) { break; } ++t;
  }
  return t - s;
}
 
unsigned int str_rchr(const char *s,int c)
{
  char ch;
  const char *t;
  const char *u;
 
  ch = c;
  t = s;
  u = 0;
  for (;;) {
    if (!*t) { break; } if (*t == ch) { u = t; } ++t;
    if (!*t) { break; } if (*t == ch) { u = t; } ++t;
    if (!*t) { break; } if (*t == ch) { u = t; } ++t;
    if (!*t) { break; } if (*t == ch) { u = t; } ++t;
  }
  if (!u) u = t;
  return u - s;
}
 
int str_start(const char *s,const char *t)
{
  char x;
 
  for (;;) {
    x = *t++; if (!x) return 1; if (x != *s++) return 0;
    x = *t++; if (!x) return 1; if (x != *s++) return 0;
    x = *t++; if (!x) return 1; if (x != *s++) return 0;
    x = *t++; if (!x) return 1; if (x != *s++) return 0;
  }
}
 
char *str_append(char *dest, char const *s)
{
  static stralloc sa = {0};
 
  stralloc_copys(&sa,dest);
  stralloc_catb(&sa,s,sizeof(s));
  return sa.s;
}