ucx: src/string.c@c067394737ca (annotated)

src/string.c@c067394737ca (annotated)

src/string.c

Sat, 03 Sep 2022 14:56:07 +0200

author: Mike Becker <universe@uap-core.de>
date: Sat, 03 Sep 2022 14:56:07 +0200
changeset 581: c067394737ca
parent 580: aac47db8da0b
child 582: 96fa7fa6af4f
permissions: -rw-r--r--

implement more string functions

 /*
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
  *
  * Copyright 2021 Mike Becker, 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 "cx/string.h"
 #include "cx/utils.h"
 #include <string.h>
 #include <stdarg.h>
 #include <stdint.h>
 #include <ctype.h>
 #ifndef _WIN32
 #include <strings.h> /* for strncasecmp() */
 #endif /* _WIN32 */
 cxmutstr cx_mutstr(char *cstring) {
     return (cxmutstr) {cstring, strlen(cstring)};
 }
 cxmutstr cx_mutstrn(
         char *cstring,
         size_t length
 ) {
     return (cxmutstr) {cstring, length};
 }
 cxstring cx_str(const char *cstring) {
     return (cxstring) {cstring, strlen(cstring)};
 }
 cxstring cx_strn(
         const char *cstring,
         size_t length
 ) {
     return (cxstring) {cstring, length};
 }
 cxstring cx_strcast(cxmutstr str) {
     return (cxstring) {str.ptr, str.length};
 }
 void cx_strfree(cxmutstr *str) {
     free(str->ptr);
     str->ptr = NULL;
     str->length = 0;
 }
 size_t cx_strlen(
         size_t count,
         ...
 ) {
     if (count == 0) return 0;
     va_list ap;
     va_start(ap, count);
     size_t size = 0;
     cx_for_n(i, count) {
         cxstring str = va_arg(ap, cxstring);
         size += str.length;
     }
     va_end(ap);
     return size;
 }
 cxmutstr cx_strcat_a(
         CxAllocator *alloc,
         size_t count,
         ...
 ) {
     cxstring *strings = calloc(count, sizeof(cxstring));
     if (!strings) abort();
     va_list ap;
     va_start(ap, count);
     // get all args and overall length
     size_t slen = 0;
     cx_for_n(i, count) {
         cxstring s = va_arg (ap, cxstring);
         strings[i] = s;
         slen += s.length;
     }
     // create new string
     cxmutstr result;
     result.ptr = cxMalloc(alloc, slen + 1);
     result.length = slen;
     if (result.ptr == NULL) abort();
     // concatenate strings
     size_t pos = 0;
     cx_for_n(i, count) {
         cxstring s = strings[i];
         memcpy(result.ptr + pos, s.ptr, s.length);
         pos += s.length;
     }
     // terminate string
     result.ptr[result.length] = '\0';
     // free temporary array
     free(strings);
     return result;
 }
 cxstring cx_strsubs(
         cxstring string,
         size_t start
 ) {
     return cx_strsubsl(string, start, string.length - start);
 }
 cxmutstr cx_strsubs_m(
         cxmutstr string,
         size_t start
 ) {
     return cx_strsubsl_m(string, start, string.length - start);
 }
 cxstring cx_strsubsl(
         cxstring string,
         size_t start,
         size_t length
 ) {
     if (start > string.length) {
         return (cxstring) {NULL, 0};
     }
     size_t rem_len = string.length - start;
     if (length > rem_len) {
         length = rem_len;
     }
     return (cxstring) {string.ptr + start, length};
 }
 cxmutstr cx_strsubsl_m(
         cxmutstr string,
         size_t start,
         size_t length
 ) {
     cxstring result = cx_strsubsl(cx_strcast(string), start, length);
     return (cxmutstr) {(char *) result.ptr, result.length};
 }
 cxstring cx_strchr(
         cxstring string,
         int chr
 ) {
     chr = 0xFF & chr;
     // TODO: improve by comparing multiple bytes at once
     cx_for_n(i, string.length) {
         if (string.ptr[i] == chr) {
             return cx_strsubs(string, i);
         }
     }
     return (cxstring) {NULL, 0};
 }
 cxmutstr cx_strchr_m(
         cxmutstr string,
         int chr
 ) {
     cxstring result = cx_strchr(cx_strcast(string), chr);
     return (cxmutstr) {(char *) result.ptr, result.length};
 }
 cxstring cx_strrchr(
         cxstring string,
         int chr
 ) {
     chr = 0xFF & chr;
     size_t i = string.length;
     while (i > 0) {
         i--;
         // TODO: improve by comparing multiple bytes at once
         if (string.ptr[i] == chr) {
             return cx_strsubs(string, i);
         }
     }
     return (cxstring) {NULL, 0};
 }
 cxmutstr cx_strrchr_m(
         cxmutstr string,
         int chr
 ) {
     cxstring result = cx_strrchr(cx_strcast(string), chr);
     return (cxmutstr) {(char *) result.ptr, result.length};
 }
 #define ptable_r(dest, useheap, ptable, index) (dest = useheap ? \
     ((size_t*)ptable)[index] : (size_t) ((uint8_t*)ptable)[index])
 #define ptable_w(useheap, ptable, index, src) do {\
     if (!useheap) ((uint8_t*)ptable)[index] = (uint8_t) src;\
     else ((size_t*)ptable)[index] = src;\
     } while (0)
 cxstring cx_strstr(
         cxstring haystack,
         cxstring needle
 ) {
     if (needle.length == 0) {
         return haystack;
     }
     /*
      * IMPORTANT:
      * Our prefix table contains the prefix length PLUS ONE
      * this is our decision, because we want to use the full range of size_t.
      * The original algorithm needs a (-1) at one single place,
      * and we want to avoid that.
      */
     /* static prefix table */
     static uint8_t s_prefix_table[512];
     /* check pattern length and use appropriate prefix table */
     /* if the pattern exceeds static prefix table, allocate on the heap */
     register int useheap = needle.length >= 512;
     register void *ptable = useheap ? calloc(needle.length + 1,
                                              sizeof(size_t)) : s_prefix_table;
     /* keep counter in registers */
     register size_t i, j;
     /* fill prefix table */
     i = 0;
     j = 0;
     ptable_w(useheap, ptable, i, j);
     while (i < needle.length) {
         while (j >= 1 && needle.ptr[j - 1] != needle.ptr[i]) {
             ptable_r(j, useheap, ptable, j - 1);
         }
         i++;
         j++;
         ptable_w(useheap, ptable, i, j);
     }
     /* search */
     cxstring result = {NULL, 0};
     i = 0;
     j = 1;
     while (i < haystack.length) {
         while (j >= 1 && haystack.ptr[i] != needle.ptr[j - 1]) {
             ptable_r(j, useheap, ptable, j - 1);
         }
         i++;
         j++;
         if (j - 1 == needle.length) {
             size_t start = i - needle.length;
             result.ptr = haystack.ptr + start;
             result.length = haystack.length - start;
             break;
         }
     }
     /* if prefix table was allocated on the heap, free it */
     if (ptable != s_prefix_table) {
         free(ptable);
     }
     return result;
 }
 cxmutstr cx_strstr_m(
         cxmutstr haystack,
         cxstring needle
 ) {
     cxstring result = cx_strstr(cx_strcast(haystack), needle);
     return (cxmutstr) {(char *) result.ptr, result.length};
 }
 size_t cx_strsplit(
         cxstring string,
         cxstring delim,
         size_t limit,
         cxstring *output
 ) {
     // TODO: implement
     return 0;
 }
 size_t cx_strsplit_a(
         CxAllocator *allocator,
         cxstring string,
         cxstring delim,
         size_t limit,
         cxstring **output
 ) {
     // TODO: implement
     return 0;
 }
 size_t cx_strsplit_m(
         cxmutstr string,
         cxstring delim,
         size_t limit,
         cxmutstr *output
 ) {
     return cx_strsplit(cx_strcast(string),
                        delim, limit, (cxstring *) output);
 }
 size_t cx_strsplit_ma(
         CxAllocator *allocator,
         cxmutstr string,
         cxstring delim,
         size_t limit,
         cxmutstr **output
 ) {
     return cx_strsplit_a(allocator, cx_strcast(string),
                          delim, limit, (cxstring **) output);
 }
 int cx_strcmp(cxstring s1, cxstring 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 cx_strcasecmp(cxstring s1, cxstring 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;
     }
 }
 cxmutstr cx_strdup_a(CxAllocator *allocator, cxstring string) {
     cxmutstr result = {
             cxMalloc(allocator, string.length + 1),
             string.length
     };
     if (result.ptr == NULL) {
         result.length = 0;
         return result;
     }
     memcpy(result.ptr, string.ptr, string.length);
     result.ptr[string.length] = '\0';
     return result;
 }
 cxstring cx_strtrim(cxstring string) {
     cxstring result = string;
     // TODO: optimize by comparing multiple bytes at once
     while (result.length > 0 && isspace(*result.ptr)) {
         result.ptr++;
         result.length--;
     }
     while (result.length > 0 && isspace(result.ptr[result.length - 1])) {
         result.length--;
     }
     return result;
 }
 cxmutstr cx_strtrim_m(cxmutstr string) {
     cxstring result = cx_strtrim(cx_strcast(string));
     return (cxmutstr) {(char *) result.ptr, result.length};
 }
 bool cx_strprefix(cxstring string, cxstring prefix) {
     if (string.length < prefix.length) return false;
     return memcmp(string.ptr, prefix.ptr, prefix.length) == 0;
 }
 bool cx_strsuffix(cxstring string, cxstring suffix) {
     if (string.length < suffix.length) return false;
     return memcmp(string.ptr + string.length - suffix.length,
                   suffix.ptr, suffix.length) == 0;
 }
 bool cx_casestrprefix(cxstring string, cxstring prefix) {
     if (string.length < prefix.length) return false;
 #ifdef _WIN32
     return _strnicmp(string.ptr, prefix.ptr, prefix.length) == 0;
 #else
     return strncasecmp(string.ptr, prefix.ptr, prefix.length) == 0;
 #endif
 }
 bool cx_casestrsuffix(cxstring string, cxstring suffix) {
     if (string.length < suffix.length) return false;
 #ifdef _WIN32
     return _strnicmp(string.ptr+string.length-suffix.length,
                   suffix.ptr, suffix.length) == 0;
 #else
     return strncasecmp(string.ptr + string.length - suffix.length,
                        suffix.ptr, suffix.length) == 0;
 #endif
 }

Mercurial > hg > ucx / annotate

src/string.c@c067394737ca (annotated)

src/string.c