Laria Carolin Chabowski
025fd61abd
A useful source reader implementation to pass in a source saved as an in-memory string into the tokenizer. This replaces the string_src_reader in the tokenizer_test and is even a bit more flexible, by allowing any aplf_string_view as the source.
47 lines
892 B
C
47 lines
892 B
C
#include <assert.h>
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#include <string.h>
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#include "apfl.h"
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#include "internal.h"
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struct string_source_reader {
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struct apfl_string_view sv;
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size_t off;
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};
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bool
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apfl_string_source_reader(void *opaque, char *buf, size_t *len, bool need)
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{
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(void)need;
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struct string_source_reader *ctx = opaque;
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size_t maxlen = *len;
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size_t remain_len = ctx->sv.len - ctx->off;
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*len = maxlen < remain_len ? maxlen : remain_len;
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memcpy(buf, ctx->sv.bytes + ctx->off, *len);
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ctx->off += *len;
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assert(ctx->off <= ctx->sv.len);
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return true;
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}
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void *
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apfl_string_source_reader_new(struct apfl_string_view sv)
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{
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struct string_source_reader *ctx = ALLOC(struct string_source_reader);
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if (ctx == NULL) {
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return NULL;
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}
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ctx->sv = sv;
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ctx->off = 0;
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return ctx;
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}
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void
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apfl_string_source_reader_destroy(void *opaque)
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{
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free(opaque);
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}
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