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/*======================================================================*/
/*= CHANGES AND UPDATES =*/
/*======================================================================*/
/*= date person file subject =*/
/*=--------------------------------------------------------------------=*/
/*= =*/
/*= 301092 hua xstring.hc created =*/
/*= =*/
/*======================================================================*/
#include "string.h"
#include "ctype.h"
#include "stdio.h"
#include "xmath.h"
#include "xstring.h"
#include "io.h"
/*======================================================================*/
/* */
/* XSTRING */
/* */
/* Some special routines for 0-terminated char [] */
/* */
/*======================================================================*/
void compress (char s [])
{delete_leading_blanks;
delete_trailing_blanks;
. delete_leading_blanks
while (first_char == ' ')
delete_first_char.
. delete_first_char
{for (int i = 0; s [i] != '\0' && s [i] != 0; i++)
s [i] = s [i+1];
}.
. delete_trailing_blanks
{int i;
skip_to_last_char;
while (last_char == ' ')
delete_last_char;
}.
. skip_to_last_char
{for (i = 0; s [i] != '\0' && s [i] != 0; i++);
i--;
}.
. delete_last_char
{last_char = 0;
i--;
}.
. first_char s [0].
. last_char s [i].
}
void strcat (char s [], int len, char app [])
{int len_s = strlen (s);
int len_app = strlen (app);
if (len_s + len_app < len)
strcat (s, app);
else strcat (s, substring (app, 0, len - len_s - 1));
}
void lower (char s [])
{char ss [1024];
int i;
for (i = 0; i < strlen (s); i++)
if (isupper (s [i]))
ss [i] = tolower (s [i]);
else ss [i] = s [i];
ss [i] = 0;
strcpy (s, ss);
}
void changeall (char s [],
int max_length_of_s,
char tmplate [],
char replacement [])
{char *pos;
while ((pos = strstr (s, tmplate)) != NULL)
perform_substitute;
. perform_substitute
{delete_tmplate;
insert_replacement;
}.
. delete_tmplate
{char *pp = pos;
while (*(pp + strlen (tmplate)) != 0)
{*(pp) = *(pp + strlen (tmplate));
pp++;
};
*pp = 0;
}.
. insert_replacement
{if (strlen (s) + strlen (replacement) < max_length_of_s)
perform_insert;
}.
. perform_insert
{char buffer [max_length_of_s];
char *pp = s;
int i = 0;
while (pp != pos)
buffer [i++] = *(pp++);
buffer [i] = 0;
strcat (buffer, replacement);
i = strlen (buffer);
while (*pp != 0)
buffer [i++] = *(pp++);
buffer [i] = 0;
strcpy (s, buffer);
}.
}
char *substring (char s [], int from)
{static bool is_init = false;
static char *result;
perhaps_delete_old_result;
calc_new_result;
return result;
. perhaps_delete_old_result
{if (is_init)
delete[] (result);
}.
. calc_new_result
{result = new char [strlen (s) - from + 2];
is_init = true;
strcpy (result, &s [from]);
}.
}
char *substring (char s [], int from, int to)
{static bool is_init = false;
static char *result;
perhaps_delete_old_result;
calc_new_result;
return result;
. perhaps_delete_old_result
{if (is_init)
delete[] (result);
}.
. calc_new_result
{int i;
result = new char [to - from + 2];
is_init = true;
for (i = from; i < to; i++)
result [i-from] = s [i];
result [i-from] = 0;
}.
}
int submatch (char s [], char p [], int &pos)
{int matched_chars = 0;
int len_s = strlen (s);
int len_p = strlen (p);
pos = len_s + 1;
for (int i = 0; i < len_s; i++)
check_sub_match;
return matched_chars;
. check_sub_match
{int j;
for (j = 0; j < len_p && (i+j) < len_s; j++)
if (s [i+j] != p [j])
break;
if (j > matched_chars)
{matched_chars = j;
pos = i;
};
}.
}
void delchar (char s [], int pos)
{for (int p = pos; p < strlen (s); p++)
s [p] = s [p+1];
}
void inschar (char s[], int pos, char n)
{if (pos < strlen (s))
handle_insert
else handle_append;
. handle_insert
{for (int i = strlen (s); i >= pos; i--)
s [i+1] = s [i];
s [pos] = n;
}.
. handle_append
{int l = strlen (s);
s [l] = n;
s [l+1] = 0;
}.
}
int strpos (char s [], char p)
{for (int i = 0 ; i < strlen (s); i++)
if (s [i] == p)
return i;
return -1;
}
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