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/*
** TRIM.C - Remove leading, trailing, & excess embedded spaces
**
** public domain by Bob Stout
*/
#include <ctype.h>
#include <string.h>
#define NUL '\0'
char *trim(char *str)
{
char *ibuf = str, *obuf = str;
int i = 0, cnt = 0;
/*
** Trap NULL
*/
if (str)
{
/*
** Remove leading spaces (from RMLEAD.C)
*/
for (ibuf = str; *ibuf && isspace(*ibuf); ++ibuf)
;
if (str != ibuf)
memmove(str, ibuf, ibuf - str);
/*
** Collapse embedded spaces (from LV1WS.C)
*/
while (*ibuf)
{
if (isspace(*ibuf) && cnt)
ibuf++;
else
{
if (!isspace(*ibuf))
cnt = 0;
else
{
*ibuf = ' ';
cnt = 1;
}
obuf[i++] = *ibuf++;
}
}
obuf[i] = NUL;
/*
** Remove trailing spaces (from RMTRAIL.C)
*/
while (--i >= 0)
{
if (!isspace(obuf[i]))
break;
}
obuf[++i] = NUL;
}
return str;
}
#ifdef TEST
#include <stdio.h>
main(int argc, char *argv[])
{
printf("trim(\"%s\") ", argv[1]);
printf("returned \"%s\"\n", trim(argv[1]));
}
#endif /* TEST */
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