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/* regsub.c */
/* This file contains the regsub() function, which performs substitutions
* after a regexp match has been found.
*/
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include "config.h"
#include "vi.h"
#include "regexp.h"
static char *previous; /* a copy of the text from the previous substitution */
/* perform substitutions after a regexp match */
void regsub(re, src, dst)
regexp *re;
REG char *src;
REG char *dst;
{
REG char *cpy;
REG char *end;
REG char c;
char *start;
#ifndef CRUNCH
int mod;
mod = 0;
#endif
start = src;
while ((c = *src++) != '\0')
{
#ifndef NO_MAGIC
/* recognize any meta characters */
if (c == '&' && *o_magic)
{
cpy = re->startp[0];
end = re->endp[0];
}
else if (c == '~' && *o_magic)
{
cpy = previous;
if (cpy)
end = cpy + strlen(cpy);
}
else
#endif /* not NO_MAGIC */
if (c == '\\')
{
c = *src++;
switch (c)
{
#ifndef NO_MAGIC
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
/* \0 thru \9 mean "copy subexpression" */
c -= '0';
cpy = re->startp[c];
end = re->endp[c];
break;
# ifndef CRUNCH
case 'U':
case 'u':
case 'L':
case 'l':
/* \U and \L mean "convert to upper/lowercase" */
mod = c;
continue;
case 'E':
case 'e':
/* \E ends the \U or \L */
mod = 0;
continue;
# endif /* not CRUNCH */
case '&':
/* "\&" means "original text" */
if (*o_magic)
{
*dst++ = c;
continue;
}
cpy = re->startp[0];
end = re->endp[0];
break;
case '~':
/* "\~" means "previous text, if any" */
if (*o_magic)
{
*dst++ = c;
continue;
}
cpy = previous;
if (cpy)
end = cpy + strlen(cpy);
break;
#else /* NO_MAGIC */
case '&':
/* "\&" means "original text" */
cpy = re->startp[0];
end = re->endp[0];
break;
case '~':
/* "\~" means "previous text, if any" */
cpy = previous;
if (cpy)
end = cpy + strlen(cpy);
break;
#endif /* NO_MAGIC */
default:
/* ordinary char preceded by backslash */
*dst++ = c;
continue;
}
}
else
{
/* ordinary character, so just copy it */
*dst++ = c;
continue;
}
/* Note: to reach this point in the code, we must have evaded
* all "continue" statements. To do that, we must have hit
* a metacharacter that involves copying.
*/
/* if there is nothing to copy, loop */
if (!cpy)
continue;
/* copy over a portion of the original */
while (cpy < end)
{
#ifndef NO_MAGIC
# ifndef CRUNCH
switch (mod)
{
case 'U':
case 'u':
/* convert to uppercase */
if (isascii(*cpy) && islower(*cpy))
{
*dst++ = toupper(*cpy);
cpy++;
}
else
{
*dst++ = *cpy++;
}
break;
case 'L':
case 'l':
/* convert to lowercase */
if (isascii(*cpy) && isupper(*cpy))
{
*dst++ = tolower(*cpy);
cpy++;
}
else
{
*dst++ = *cpy++;
}
break;
default:
/* copy without any conversion */
*dst++ = *cpy++;
}
/* \u and \l end automatically after the first char */
if (mod && (mod == 'u' || mod == 'l'))
{
mod = 0;
}
# else /* CRUNCH */
*dst++ = *cpy++;
# endif /* CRUNCH */
#else /* NO_MAGIC */
*dst++ = *cpy++;
#endif /* NO_MAGIC */
}
}
*dst = '\0';
/* remember what text we inserted this time */
if (previous)
free(previous);
previous = (char *)malloc((unsigned)(strlen(start) + 1));
if (previous)
strcpy(previous, start);
}
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