ucx: ucx/string.c@35490eb48214 (annotated)

ucx/string.c@35490eb48214 (annotated)

ucx/string.c

Mon, 20 Feb 2017 15:25:28 +0100

author: Mike Becker <universe@uap-core.de>
date: Mon, 20 Feb 2017 15:25:28 +0100
changeset 231: 35490eb48214
parent 225: a1a068c2c4ef
child 233: bd58fdde142d
permissions: -rw-r--r--

improves handling of special cases delimiter size >= string size in sstrsplit

 /*
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
  *
  * Copyright 2016 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 <ctype.h>
 #include "string.h"
 #include "allocator.h"
 sstr_t sstr(char *cstring) {
     sstr_t string;
     string.ptr = cstring;
     string.length = strlen(cstring);
     return string;
 }
 sstr_t sstrn(char *cstring, size_t length) {
     sstr_t string;
     string.ptr = cstring;
     string.length = length;
     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 = 1 ; i < n ; i++) {
         sstr_t str = va_arg(ap, sstr_t);
         size += str.length;
     }
     va_end(ap);
     return size;
 }
 static sstr_t sstrvcat_a(
         UcxAllocator *a,
         size_t count,
         sstr_t s1,
         sstr_t s2,
         va_list ap) {
     sstr_t str;
     str.ptr = NULL;
     str.length = 0;
     if(count < 2) {
         return str;
     }
     sstr_t *strings = (sstr_t*) calloc(count, sizeof(sstr_t));
     if(!strings) {
         return str;
     }
     // get all args and overall length
     strings[0] = s1;
     strings[1] = s2;
     size_t strlen = s1.length + s2.length;
     for (size_t i=2;i<count;i++) {
         sstr_t s = va_arg (ap, sstr_t);
         strings[i] = s;
         strlen += s.length;
     }
     // create new string
     str.ptr = (char*) almalloc(a, strlen + 1);
     str.length = strlen;
     if(!str.ptr) {
         free(strings);
         str.length = 0;
         return str;
     }
     // concatenate strings
     size_t pos = 0;
     for (size_t i=0;i<count;i++) {
         sstr_t s = strings[i];
         memcpy(str.ptr + pos, s.ptr, s.length);
         pos += s.length;
     }
     str.ptr[str.length] = '\0';
     free(strings);
     return str;
 }
 sstr_t sstrcat(size_t count, sstr_t s1, sstr_t s2, ...) {
     va_list ap;
     va_start(ap, s2);
     sstr_t s = sstrvcat_a(ucx_default_allocator(), count, s1, s2, ap);
     va_end(ap);
     return s;
 }
 sstr_t sstrcat_a(UcxAllocator *a, size_t count, sstr_t s1, sstr_t s2, ...) {
     va_list ap;
     va_start(ap, s2);
     sstr_t s = sstrvcat_a(a, count, s1, s2, ap);
     va_end(ap);
     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) {
         new_sstr.ptr = NULL;
         new_sstr.length = 0;
     } else {
         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 sstrrchr(sstr_t s, int c) {
     if (s.length > 0) {
         for(size_t i=s.length;i>0;i--) {
             if(s.ptr[i-1] == c) {
                 return sstrsubs(s, i-1);
             }
         }
     }
     sstr_t n;
     n.ptr = NULL;
     n.length = 0;
     return n;
 }
 sstr_t sstrstr(sstr_t string, sstr_t match) {
     if (match.length == 0) {
         return string;
     }
     for (size_t i = 0 ; i < string.length ; i++) {
         sstr_t substr = sstrsubs(string, i);
         if (sstrprefix(substr, match)) {
             return substr;
         }
     }
     sstr_t emptystr;
     emptystr.length = 0;
     emptystr.ptr = NULL;
     return emptystr;
 }
 sstr_t* sstrsplit(sstr_t s, sstr_t d, ssize_t *n) {
     return sstrsplit_a(ucx_default_allocator(), s, d, n);
 }
 sstr_t* sstrsplit_a(UcxAllocator *allocator, sstr_t s, sstr_t d, ssize_t *n) {
     if (s.length == 0 || d.length == 0) {
         *n = -1;
         return NULL;
     }
     /* special cases: delimiter is at least as large as the string */
     if (d.length >= s.length) {
         /* exact match */
         if (sstrcmp(s, d) == 0) {
             *n = 0;
             return NULL;
         } else /* no match possible */ {
             *n = 1;
             sstr_t *result = (sstr_t*) almalloc(allocator, sizeof(sstr_t));
             result->ptr = (char*) almalloc(allocator, 1+s.length);
             memcpy(result->ptr, s.ptr, s.length);
             result->ptr[s.length] = '\0';
             result->length = s.length;
             return result;
         }
     }
     sstr_t* result;
     ssize_t nmax = *n;
     *n = 1;
     sstr_t sv = sstrdup(s);
     if (sv.length == 0) {
         *n = -2;
         return NULL;
     }
     for (size_t i = 0 ; i < s.length ; i++) {
         sstr_t substr = sstrsubs(sv, i);
         if (sstrprefix(substr, d)) {
             (*n)++;
             for (size_t j = 0 ; j < d.length ; j++) {
                 sv.ptr[i+j] = 0;
             }
             i += d.length - 1; // -1, because the loop will do a i++
         }
         if ((*n) == nmax) break;
     }
     result = (sstr_t*) almalloc(allocator, sizeof(sstr_t)*(*n));
     if (result) {
         char *pptr = sv.ptr;
         for (ssize_t i = 0 ; i < *n ; i++) {
             size_t l = strlen(pptr);
             char* ptr = (char*) almalloc(allocator, l + 1);
             if (ptr) {
                 memcpy(ptr, pptr, l);
                 ptr[l] = '\0';
                 result[i] = sstrn(ptr, l);
                 pptr += l + d.length;
             } else {
                 for (ssize_t j = i-1 ; j >= 0 ; j--) {
                     alfree(allocator, result[j].ptr);
                 }
                 alfree(allocator, result);
                 *n = -2;
                 break;
             }
         }
     } else {
         *n = -2;
     }
     free(sv.ptr);
     return result;
 }
 int sstrcmp(sstr_t s1, sstr_t s2) {
     if (s1.length == s2.length) {
         return memcmp(s1.ptr, s2.ptr, s1.length);
     } else if (s1.length > s2.length) {
         return 1;
     } else {
         return -1;
     }
 }
 int sstrcasecmp(sstr_t s1, sstr_t s2) {
     if (s1.length == s2.length) {
 #ifdef _WIN32
         return _strnicmp(s1.ptr, s2.ptr, s1.length);
 #else
         return strncasecmp(s1.ptr, s2.ptr, s1.length);
 #endif
     } else if (s1.length > s2.length) {
         return 1;
     } else {
         return -1;
     }
 }
 sstr_t sstrdup(sstr_t s) {
     return sstrdup_a(ucx_default_allocator(), s);
 }
 sstr_t sstrdup_a(UcxAllocator *allocator, sstr_t s) {
     sstr_t newstring;
     newstring.ptr = (char*)almalloc(allocator, s.length + 1);
     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;
     while (newstr.length > 0 && isspace(*newstr.ptr)) {
         newstr.ptr++;
         newstr.length--;
     }
     while (newstr.length > 0 && isspace(newstr.ptr[newstr.length-1])) {
         newstr.length--;
     }
     return newstr;
 }
 int sstrprefix(sstr_t string, sstr_t prefix) {
     if (string.length == 0) {
         return prefix.length == 0;
     }
     if (prefix.length == 0) {
         return 1;
     }
     if (prefix.length > string.length) {
         return 0;
     } else {
         return memcmp(string.ptr, prefix.ptr, prefix.length) == 0;
     }
 }
 int sstrsuffix(sstr_t string, sstr_t suffix) {
     if (string.length == 0) {
         return suffix.length == 0;
     }
     if (suffix.length == 0) {
         return 1;
     }
     if (suffix.length > string.length) {
         return 0;
     } else {
         return memcmp(string.ptr+string.length-suffix.length,
             suffix.ptr, suffix.length) == 0;
     }
 }
 sstr_t sstrlower(sstr_t string) {
     sstr_t ret = sstrdup(string);
     for (size_t i = 0; i < ret.length ; i++) {
         ret.ptr[i] = tolower(ret.ptr[i]);
     }
     return ret;
 }
 sstr_t sstrlower_a(UcxAllocator *allocator, sstr_t string) {
     sstr_t ret = sstrdup_a(allocator, string);
     for (size_t i = 0; i < ret.length ; i++) {
         ret.ptr[i] = tolower(ret.ptr[i]);
     }
     return ret;
 }
 sstr_t sstrupper(sstr_t string) {
     sstr_t ret = sstrdup(string);
     for (size_t i = 0; i < ret.length ; i++) {
         ret.ptr[i] = toupper(ret.ptr[i]);
     }
     return ret;
 }
 sstr_t sstrupper_a(UcxAllocator *allocator, sstr_t string) {
     sstr_t ret = sstrdup_a(allocator, string);
     for (size_t i = 0; i < ret.length ; i++) {
         ret.ptr[i] = toupper(ret.ptr[i]);
     }
     return ret;
 }

Mercurial > hg > ucx / annotate

ucx/string.c@35490eb48214 (annotated)

ucx/string.c