53 lines
1.6 KiB
C
53 lines
1.6 KiB
C
/** Dynamic contiguous string that is used to load files into a
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`struct char_array`. */
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#include "text.h"
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#include <stdio.h>
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#include <limits.h>
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#define ARRAY_NAME char
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#define ARRAY_TYPE char
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#define ARRAY_BODY
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#include "../src/array.h"
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/** @return Idle. */
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struct char_array text(void) { return char_array(); }
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/** Destroys `text`. */
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void text_(struct char_array *const text) { char_array_(text); }
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/** Append a text file, `fn`, to `text`, and add a '\0'.
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@return The start of the appended file or null on error. A partial read is a
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failure. @throws[fopen, fread, realloc]
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@throws[EISEQ] The text file has embedded nulls. */
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char *text_append_file(struct char_array *text, const char *const fn) {
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FILE *fp = 0;
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const size_t granularity = 1024;
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size_t nread, start;
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char *cursor;
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int success = 1;
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assert(text && fn);
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start = text->size;
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if(!(fp = fopen(fn, "r"))) goto catch;
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/* Read entire file in chunks. We don't allow any text file to go over
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`INT_MAX` because `printf("%.*s", int, char *)` is used. */
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do if(!(cursor = char_array_buffer(text, granularity))
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|| (nread = fread(cursor, 1, granularity, fp), ferror(fp))
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|| !char_array_append(text, nread)
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|| text->size - start >= INT_MAX) goto catch;
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while(nread == granularity);
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/* File to `C` string. */
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if(!(cursor = char_array_new(text))) goto catch;
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*cursor = '\0';
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/* Binary files with embedded '\0' are not allowed; check just this read. */
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if(strchr(text->data + start, '\0') != cursor)
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{ errno = EILSEQ; goto catch; }
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goto finally;
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catch:
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if(!errno) errno = EILSEQ; /* Will never be true on POSIX. */
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success = 0;
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finally:
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if(fp) fclose(fp);
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return success ? text->data + start : 0;
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}
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