Mercurial > hg > ucx / file revision

 /*

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.

  *

  * Copyright 2013 Olaf Wintermann. All rights reserved.

  *

  * Redistribution and use in source and binary forms, with or without

  * modification, are permitted provided that the following conditions are met:

  *

  *   1. Redistributions of source code must retain the above copyright

  *      notice, this list of conditions and the following disclaimer.

  *

  *   2. Redistributions in binary form must reproduce the above copyright

  *      notice, this list of conditions and the following disclaimer in the

  *      documentation and/or other materials provided with the distribution.

  *

  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE

  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

  * POSSIBILITY OF SUCH DAMAGE.

  */

 #include <stdlib.h>

 #include <string.h>

 #include <stdarg.h>

 #include "string.h"

 sstr_t sstr(char *s) {

     sstr_t string;

     string.ptr = s;

     string.length = strlen(s);

     return string;

 }

 sstr_t sstrn(char *s, size_t n) {

     sstr_t string;

     string.ptr = s;

     string.length = n;

     return string;

 }

 size_t sstrnlen(size_t n, sstr_t s, ...) {

     va_list ap;

     size_t size = s.length;

     va_start(ap, s);

     for (size_t i = 0 ; i < n-1 ; i++) {

         sstr_t str = va_arg(ap, sstr_t);

         size += str.length;

     }

     va_end(ap);

     return size;

 }

 sstr_t sstrncat(size_t n, sstr_t s, sstr_t c1, ...) {

     va_list ap;

     va_start(ap, c1);

     s.ptr[0] = 0;

     size_t len = s.length;

     size_t cplen = c1.length > len ? len : c1.length;

     char   *ptr = s.ptr;

     memcpy(ptr, c1.ptr, cplen);

     len -= cplen;

     ptr += cplen;

     for (size_t i = 0 ; i < n-1 ; i++) {

         sstr_t str = va_arg (ap, sstr_t);

         cplen = str.length > len ? len : str.length;

         if(cplen <= 0) {

             va_end(ap);

             return s;

         }

         memcpy(ptr, str.ptr, cplen);

         len -= cplen;

         ptr += cplen;

     }

     va_end(ap);

     s.length = ptr - s.ptr;

     return s;

 }

 sstr_t sstrsubs(sstr_t s, size_t start) {

     return sstrsubsl (s, start, s.length-start);

 }

 sstr_t sstrsubsl(sstr_t s, size_t start, size_t length) {

     sstr_t new_sstr;

     if (start >= s.length) {

         return s;

     }

     if (length > s.length-start) {

         length = s.length-start;

     }

     new_sstr.ptr = &s.ptr[start];

     new_sstr.length = length;

     return new_sstr;

 }

 sstr_t sstrchr(sstr_t s, int c) {

     for(size_t i=0;i<s.length;i++) {

         if(s.ptr[i] == c) {

             return sstrsubs(s, i);

         }

     }

     sstr_t n;

     n.ptr = NULL;

     n.length = 0;

     return n;

 }

 sstr_t* sstrsplit(sstr_t s, sstr_t d, size_t *n) {

     if (d.length == 0) {

         return NULL;

     }

     sstr_t* result;

     size_t nmax = *n;

     *n = 1;

     /* special case: exact match - no processing needed */

     if (s.length == d.length && strncmp(s.ptr, d.ptr, s.length) == 0) {

         *n = 0;

         return NULL;

     }

     sstr_t sv = sstrdup(s);

     for (size_t i = 0 ; i < s.length ; i++) {

         if (sv.ptr[i] == d.ptr[0]) {

             _Bool match = 1;

             for (size_t j = 1 ; j < d.length ; j++) {

                 if (j+i < s.length) {

                     match &= (sv.ptr[i+j] == d.ptr[j]);

                 } else {

                     match = 0;

                     break;

                 }

             }

             if (match) {

                 (*n)++;

                 for (size_t j = 0 ; j < d.length ; j++) {

                     sv.ptr[i+j] = 0;

                 }

                 i += d.length;

             }

         }

         if ((*n) == nmax) break;

     }

     result = (sstr_t*) malloc(sizeof(sstr_t) * (*n));

     char *pptr = sv.ptr;

     for (size_t i = 0 ; i < *n ; i++) {

         size_t l = strlen(pptr);

         char* ptr = (char*) malloc(l + 1);

         memcpy(ptr, pptr, l);

         ptr[l] = 0;

         result[i] = sstrn(ptr, l);

         pptr += l + d.length;

     }

     free(sv.ptr);

     return result;

 }

 int sstrcmp(sstr_t s1, sstr_t s2) {

     return strncmp(s1.ptr, s2.ptr, s1.length>s2.length ? s2.length: s1.length);

 }

 sstr_t sstrdup(sstr_t s) {

     sstr_t newstring;

     newstring.ptr = (char*) malloc(s.length + 1);

     newstring.length = 0;

     if (newstring.ptr) {

         newstring.length = s.length;

         newstring.ptr[newstring.length] = 0;

         memcpy(newstring.ptr, s.ptr, s.length);

     } else {

         newstring.length = 0;

     }

     return newstring;

 }

 sstr_t sstrtrim(sstr_t string) {

     sstr_t newstr = string;

     if (string.length == 0) {

         return newstr;

     }

     size_t i;

     for(i=0;i<string.length;i++) {

         char c = string.ptr[i];

         if(c > 32) {

             break;

         }

     }

     newstr.ptr = &string.ptr[i];

     newstr.length = string.length - i;

     if(newstr.length == 0) {

         return newstr;

     }

     i = newstr.length - 1;

     for(;;) {

         char c = newstr.ptr[i];

         if(c > 32) {

             break;

         }

         if(i > 0) {

             i--;

         } else {

             break;

         }

     }

     newstr.length = i + 1;

     return newstr;

 }