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/* misc.c */
/* Copyright 1995 by Steve Kirkendall */
char id_misc[] = "$Id: misc.c,v 2.11 1997/10/17 18:42:24 steve Exp $";
#include "elvis.h"
/* This is used as a zero-length string */
CHAR empty[1];
/* This is used when we need a bunch of blanks */
CHAR blanks[] = " ";
/* These store the args list. The "arglist" variable points to a dynamically
* allocated array of (char *) pointers. Each element of the array ppoints to
* a dynamically allocated string, except that the last one is NULL. The
* "argnext" variable stores the index of the next (not current!) element
* to be edited.
*/
char **arglist; /* array of strings (dynamically allocated) */
int argnext; /* index into arglist[] of next arg */
/* This function appends a single character to a dynamically-allocated
* string. A NUL character is always appended after the last character,
* but this function also supports NUL characters in the middle of the
* string.
*
* Only one string can be under construction at a time. To start a string,
* Call this function with a pointer to a (CHAR *) variable which is NULL.
* To append to that string, call this function with a pointer to the same
* (CHAR *) variable.
*
* This function updates the value of the (CHAR *) variable whenever it
* reallocates memory. It returns the number of characters added so far,
* excluding the terminal NUL.
*/
int buildCHAR(refstr, ch)
CHAR **refstr; /* pointer to variable which points to string */
_CHAR_ ch; /* character to append to that string */
{
static int len; /* length of the string so far */
CHAR *newp; /* new memory for the same string */
#define GRANULARITY 32 /* minimum number of chars to allocate */
/* if the string pointer is currently NULL, then start a new string */
if (!*refstr)
{
len = 0;
*refstr = (CHAR *)safealloc(GRANULARITY, sizeof(CHAR));
}
/* if the string is expanding beyond the current allocated memory,
* then allocate some new memory and copy the string into it.
*/
if ((len + 1) % GRANULARITY == 0)
{
newp = (CHAR *)safealloc(len + 1 + GRANULARITY, sizeof(CHAR));
memcpy(newp, *refstr, len * sizeof(CHAR));
safefree(*refstr);
*refstr = newp;
}
/* append the new character, and a NUL character */
(*refstr)[len++] = ch;
(*refstr)[len] = '\0';
return len;
}
/* This function calls buildCHAR() for each character of an argument string.
* Note that the string is a plain old "char" string, not a "CHAR" string.
*/
int buildstr(refstr, add)
CHAR **refstr; /* pointer to variable which points to string */
char *add; /* a string to be added */
{
int len;
for (len = 0; *add; add++)
len = buildCHAR(refstr, *add);
return len;
}
/* This function finds the endpoints of the word at a given point. Upon
* return, the offset of the argument MARK will have been changed to the
* character after the end of the word, and this function will return a
* static temporary MARK which points to the start of the word. Exception:
* If the argument MARK isn't on a word, this function leaves it unchanged
* and returns NULL.
*/
MARK wordatcursor(cursor)
MARK cursor; /* some point in the word */
{
static MARKBUF retmark;/* the return value */
CHAR *p;
/* If "cursor" is NULL, fail */
if (!cursor)
{
return NULL;
}
/* If "cursor" isn't on a letter, digit, or underscore, then fail */
scanalloc(&p, cursor);
if (!p || (!isalnum(*p) && *p != '_'))
{
scanfree(&p);
return NULL;
}
/* search back to the start of the word */
retmark = *cursor;
do
{
scanprev(&p);
markaddoffset(&retmark, -1);
} while (p && (isalnum(*p) || *p == '_'));
markaddoffset(&retmark, 1);
/* search forward to the end of the word */
scanseek(&p, cursor);
do
{
scannext(&p);
} while (p && (isalnum(*p) || *p == '_'));
marksetoffset(cursor, markoffset(scanmark(&p)));
/* clean up & return the front of the word */
scanfree(&p);
return &retmark;
}
/* Return a copy of str with backslashes before chars. The calling function
* is responsible for freeing the returned string when it is no longer needed.
*
* This also adds a backslash before each existing backslash, unless the
* existing backslash is followed by a letter or digit, or appears at the end
* of str.
*/
CHAR *addquotes(chars, str)
CHAR *chars; /* list of chars to be quoted, other than backslash */
CHAR *str; /* the string to be quoted */
{
CHAR *tmp;
/* build a quoted copy of the string */
for (tmp = NULL; *str; str++)
{
if ((*str == '\\' && str[1] && !isalnum(str[1]))
|| CHARchr(chars, *str))
buildCHAR(&tmp, '\\');
buildCHAR(&tmp, *str);
}
/* if empty string, then return "" instead of NULL */
if (tmp == NULL)
tmp = (CHAR *)safealloc(1, sizeof(CHAR));
/* return the copy */
return tmp;
}
/* Return a copy of str, from which the backslash characters have been
* removed if they're followed by certain other characters. This is intended
* to be the exact opposite of the addquotes() function.
*/
CHAR *removequotes(chars, str)
CHAR *chars; /* list of chars to be quoted, other than backslash */
CHAR *str; /* the string to be quoted */
{
CHAR *tmp;
/* build an unquoted copy of the string */
for (tmp = NULL; *str; str++)
{
if (*str != '\\'
|| (!str[1] || (str[1] != '\\' && !CHARchr(chars, str[1]))))
buildCHAR(&tmp, *str);
}
/* if empty string, then return "" instead of NULL */
if (tmp == NULL)
tmp = (CHAR *)safealloc(1, sizeof(CHAR));
/* return the copy */
return tmp;
}
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