min_array/test/test_array.c

/** This is a test for `min_array.h`: takes an arbitrary stream, (Cntl-d stops
 in some implementations of interactive terminals,) and greedily extracts
 integers in the style of `strtol` until it gets to the end-of-file or a
 null-terminator. */

#include <stdlib.h> /* size_t EXIT_ strtol */
#include <stdio.h>  /* FILE fopen fclose fread [f]printf ferror perror */
#include <string.h> /* strpbrk */
#include <errno.h>  /* errno */
#include <ctype.h>  /* isdigit */
#include <limits.h> /* LONG_ INT_ _MIN _MAX */
#include <assert.h> /* assert */
#include "../src/min_array.h"

struct num { size_t line; int num; };

MIN_ARRAY(char, char)
MIN_ARRAY(num, struct num)

/** Reads the contents of `fp` after the file pointer and appends them to
 `string`; adds a null-terminator. Does not check for nulls in `fp` or `string`.
 @return Success, otherwise `string` may have read a partial read and may not
 be terminated. @throws[fread, malloc] */
static int fp_to_str(FILE *const fp, struct char_array *const string) {
	const size_t granularity = 1024;
	size_t nread;
	char *cursor;
	assert(fp && string);
	do if(!(cursor = char_array_buffer(string, granularity))
		|| !char_array_append(string,
		nread = fread(cursor, 1, granularity, fp))) return 0;
	while(nread == granularity); assert(nread < granularity);
	if(ferror(fp) || !(cursor = char_array_new(string))) return 0;
	*cursor = '\0';
	return 1;
}

/** Stores the entire stream and then stores the extracted `int` numbers. */
int main(void) {
	int success = EXIT_FAILURE;
	struct char_array str = MIN_ARRAY_IDLE;
	struct num_array nums = MIN_ARRAY_IDLE;
	struct num *num;
	long big_num;
	char *a, *anum = 0;
	size_t i, line = 1 /* Unix: delimited by '\n'. */;
	errno = 0; /* In case we are running it as part of another editor. */
	if(!fp_to_str(stdin, &str)) goto catch;
	/* It would be conceivable use the length to continue past the first
	 sentinel '\0', but not that complex. */
	fprintf(stderr, "Read:\n<<<%s>>>\n", str.data);
	for(a = str.data; a = strpbrk(a, "-0123456789\n"); ) {
		if(*a == '\n') { line++; a++; continue; }
		if(*a == '-') { anum = a++; continue; }
		if(!anum || anum != a - 1) anum = a; /* Wasn't negative. */
		big_num = strtol(anum, &a, 0);
		if((!big_num || big_num == LONG_MIN || big_num == LONG_MAX) && errno)
			goto catch; /* Long conversion failed, (not all platforms.) */
		if(big_num < INT_MIN || big_num > INT_MAX)
			{ errno = ERANGE; goto catch; }
		if(!(num = num_array_new(&nums))) goto catch;
		num->line = line;
		num->num  = (int)big_num;
	}
	fprintf(stderr, "Extracted:\n");
	for(i = 0; i < nums.size; i++) printf("Line %lu: %d\n",
		(unsigned long)nums.data[i].line, nums.data[i].num);
	success = EXIT_SUCCESS;
	goto finally;
catch:
	fprintf(stderr, "Line %lu ", (unsigned long)line), perror("stdin");
finally:
	char_array_(&str);
	num_array_(&nums);
	return success;
}