C/C++ Users Group Library 1996 July/C-C++ Users Group Library July 1996.iso/vol_100/118_01/string.bds

Text File | 1980-07-08 | 5KB | 311 lines

/* Sting manipulation routines for Software Tools
 * source:  string.bds
 * version: July 25, 1981
 */


#include tools.h


/*  concat - concatenate two strings together */

concat (buf1, buf2, outstr)
char *buf1, *buf2, *outstr;
{

    int i;

    i = 0;
    stcopy (buf1, 0, outstr, &i);
    scopy  (buf2, 0, outstr,  i);
}

/*  getwrd - get non-blank word from in [i] into out []
 *           increment i.
 *           return j = the number of characters copied.
 *
 * calling sequence:  j = getwrd (in, &i, out);
 */

int getwrd (in, ii, out)
char *in, *out;
int  *ii;
{

    int i, j;

    i = *ii;

    while (in[i] == ' ' || in[i] == TAB) {
        i++;
    }

    j = 0;
    while ( in[i] != EOS &&
            in[i] != ' ' &&
            in[i] != TAB &&
            in[i] != NEWLINE
          ) {
        out[j++] = in[i++];
    }
    out[j] = EOS;
    *ii = i;
    return(j);
}

/*  sdrop --- drop chars from a string APL-style
 *            if chars <  0 drop chars from end of string
 *            if chars >= 0 drop chars from start of string
 *            return length of new string
 */

int sdrop (from, to, chars)
char *from, *to;
int chars;
{

    int len, start;

    len = length (from);
    if (chars < 0) {
        return (ctoc (from, to, len + chars));
    }
    else {
        start = min (chars, len);
        return (ctoc (from + start, to, len));
    }

}

/*  stake --- take chars from a string APL-style
 *            if chars <  0  take chars from end
 *            if chars >= 0  take chars from beginning
 *            return number of chars taken
 */

int stake (from, to, chars)
char *from, *to;
int chars;
{

    int len, start;

    len = length (from);
    if (chars < 0) {
        start = max(len + chars, 0);
        return (ctoc (from + start, to, len));
        }
    else {
        return (ctoc (from, to, chars));
    }
}

/*  strcmp - compare 2 strings
 *  return -1 if <, 0 if =, +1 if >
 */

int strcmp (str1, str2)
char *str1, *str2;
{

    int i;

    for (i = 0; str1[i] == str2[i]; i++) {
        if (str1[i] == EOS) {
            return(0);
        }
    }

    if (str1[i] == EOS) {
        return(-1);
    }
    else if (str2[i] == EOS) {
        return(1);
    }
    else if (str1[i] < str2[i]) {
        return(-1);
    }
    else {
        return(1);
    }
}

/*  strim - trim trailing blanks and tabs from a string
 *          return number of characters in str []
 */

int strim (str)
char *str;
{

    int i, j;

    for (i = 0, j = 0; str[i] != EOS; i++) {
        if (str[i] != BLANK && str[i] != TAB) {
            j = i;
        }
    }
    str [j + 1] = EOS;
    return (j);
}

/*  slstr --- slice a substring from a string
 *            if first < 0  count backwards from end
 *            if chars < 0  count backwards from first
 *            return the number of characters in the slice
 */

int slstr (from, to, first, chars)
char *from, *to;
int first, chars;
{

    int i, k, last, len;

    len = length (from);

    if (first < 0) {
        /* count backwards from end */
        first += len;
    }
    if (chars < 0) {
        /* count backwards from first */
        first += chars;
        chars = - chars;
    }

    first = max (0, first);
    last  = min (len, first + chars);

    for (k = 0, i = first; k < last; ) {
        to [k++] = from[i++];
    }
    to [k] = EOS;
    return(k);
}

/*  type - determine type of char */

char type (c)
int c;
{
    if (('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z')) {
        return('a');
    }
    else if ('0' <= c && c <= '9') {
        return('0');
    }
    else {
        return(c);
    }
}

/*  skipbl - skip blanks and tabs at lin[i]
 *           point i past blanks.
 *         calling sequence:  skipbl(lin, &i);
 */

skipbl(lin, i)
char *lin;
int *i;
{
    while (lin [*i] == BLANK || lin [*i] == TAB) {
        (*i)++;
    }
}

/*  equal - compare str1 to str2 */

BOOL equal (str1, str2)
char *str1, *str2;
{

    int i;

    for (i = 0; str1 [i] == str2 [i]; i++) {
        if (str1 [i] == EOS) {
            return (YES);
        }
    }
    return (NO);
}

/*  locate --- look for c in char class at pat (offset) */

BOOL locate (c, pat, offset)
char c, *pat;
int offset;
{

    int i;

    /*  size of class is at pat [offset], chars follow */

    for (i = offset + pat [offset]; i > offset; i--) {
        if (c == pat [i]) {
            return (YES);
        }
    }
    return (NO);
}

/*  scopy - copy string at from (i) to to (j) */

scopy (from, i, to, j)
char *from, *to;
int i, j;
{
    while ((to [j++] = from [i++]) != EOS) {
        ;
    }
}

/* stcopy - copy string at from [i] to to [j]
 *          update j to point AT the EOS
 *
 * calling sequence: stcopy (from, i, to, &j);
 */

stcopy (from, i, to, j)
char *from, *to;
int i;
int *j;
{
    while ((to [*j] = from [i++]) != EOS) {
        (*j)++;
    }
}

/*  index - find char  c  in string  str */

int index (str, c)
char *str, c;
{

    int i;

    for (i = 0; str [i] != EOS; i++) {
        if (str [i] == c) {
            return(i);
        }
    }
    return (-1);
}

/*  length - compute length of string
 *           do not count EOS in length
 */

int length (str)
char *str;
{
    int i;

    for (i = 0; str [i] != EOS; i++) {
        ;
    }
    return(i);
}