93 lines
2.1 KiB
C
93 lines
2.1 KiB
C
/* sv.c: String views
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* Created: 2025-08-21
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* Author: Aryadev Chavali
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* License: See end of file
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* Commentary:
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*/
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#include <malloc.h>
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#include <string.h>
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#include <alisp/sv.h>
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sv_t sv_copy(sv_t old)
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{
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if (old.size == 0)
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return SV(old.data, 0);
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else if (old.data == NULL)
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return SV(NULL, old.size);
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char *newstr = calloc(1, (old.size + 1) * sizeof(*newstr));
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memcpy(newstr, old.data, old.size);
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newstr[old.size] = '\0';
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return SV(newstr, old.size);
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}
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sv_t sv_chop_left(sv_t sv, u64 size)
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{
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if (sv.size <= size)
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return SV(NULL, 0);
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return SV(sv.data + size, sv.size - size);
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}
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sv_t sv_chop_right(sv_t sv, u64 size)
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{
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if (sv.size <= size)
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return SV(NULL, 0);
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return SV(sv.data, sv.size - size);
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}
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sv_t sv_substr(sv_t sv, u64 position, u64 size)
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{
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return sv_chop_right(sv_chop_left(sv, position), size);
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}
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sv_t sv_truncate(sv_t sv, u64 newsize)
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{
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if (newsize >= sv.size)
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return sv;
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return SV(sv.data, newsize);
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}
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sv_t sv_till(sv_t sv, const char *reject)
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{
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if (sv.size == 0 || !sv.data)
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return SV(NULL, 0);
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u64 offset;
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for (offset = 0; offset < sv.size && strchr(reject, sv.data[offset]) == NULL;
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++offset)
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continue;
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if (offset == sv.size)
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return sv;
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return sv_truncate(sv, offset);
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}
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sv_t sv_while(sv_t sv, const char *accept)
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{
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if (sv.size == 0 || !sv.data)
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return SV(NULL, 0);
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u64 offset;
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for (offset = 0; offset < sv.size && strchr(accept, sv.data[offset]) != NULL;
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++offset)
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continue;
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if (offset == sv.size)
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return sv;
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return sv_truncate(sv, offset);
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}
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/* Copyright (C) 2025, 2026 Aryadev Chavali
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License Version 2 for
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* details.
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* You may distribute and modify this code under the terms of the GNU General
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* Public License Version 2, which you should have received a copy of along with
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* this program. If not, please go to <https://www.gnu.org/licenses/>.
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*/
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