60 lines
1.6 KiB
C
60 lines
1.6 KiB
C
/*
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* Copyright (c) 2014 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* string/stresep.c
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* Extract a token from a string while handling escape characters.
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*/
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#include <stdbool.h>
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#include <string.h>
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char* stresep(char** string_ptr, const char* delim, int escape)
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{
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char* token = *string_ptr;
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if ( !token )
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return NULL;
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size_t consumed_length = 0;
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size_t token_length = 0;
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bool escaped = false;
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while ( true )
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{
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char c = token[consumed_length++];
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bool true_nul = c == '\0';
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if ( !escaped && escape && (unsigned char) c == (unsigned char) escape )
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{
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escaped = true;
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continue;
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}
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if ( !escaped && c != '\0' )
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{
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for ( size_t i = 0; delim[i]; i++ )
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{
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if ( c != delim[i] )
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{
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c = '\0';
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break;
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}
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}
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}
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token[token_length++] = c;
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escaped = false;
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if ( c == '\0' )
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{
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*string_ptr = true_nul ? (char*) NULL : token + consumed_length;
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return token;
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}
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}
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}
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