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#include <stdio.h>
#include <stdbool.h>
#include <string.h>
/* Copy stdin to stdout, replacing consecutive spaces with a single space
Edge case: a leading space is retained if there are leading spaces.
Edge case: an empty file just doesn't echo anything, but emits a warning on stderr */
int remspace(FILE* fin, FILE* fout, FILE* ferr) {
int c = fgetc(fin);
if (c == EOF) {
fprintf(ferr, "warning: no input\n");
goto exit;
}
fputc(c, fout);
bool bl = (c == ' ');
while ((c = fgetc(fin)) != EOF) {
if ((!bl) || (c != ' ')) {
fputc(c, fout);
}
bl = (c == ' ');
}
exit:
fflush(fout);
fflush(ferr);
return 0;
}
#ifndef test
int main(void) {
return remspace(stdin, stdout, stderr);
}
#else
#include "CuTest.h"
void do_test(CuTest* tc, char* input, const char* expected, const char* err_expected) {
char buf[100] = {0};
char err_buf[100] = {0};
FILE* tin = fmemopen(input, strlen(input), "r");
FILE* tout = fmemopen(buf, 100, "w");
FILE* terr = fmemopen(err_buf, 100, "w");
int res = remspace(tin, tout, terr);
CuAssertIntEquals(tc, 0, res);
CuAssertStrEquals(tc, expected, buf);
CuAssertStrEquals(tc, err_expected, err_buf);
}
void test_remspace_empty(CuTest* tc) {
do_test(tc, "", "", "warning: no input\n");
}
void test_remspace_oneword(CuTest* tc) {
do_test(tc, "foobar", "foobar", "");
}
void test_remspace_leadtrailspace(CuTest* tc) {
do_test(tc, " foo bar ", " foo bar ", "");
}
CuSuite* remspace_suite() {
CuSuite* suite = CuSuiteNew();
SUITE_ADD_TEST(suite, test_remspace_empty);
SUITE_ADD_TEST(suite, test_remspace_oneword);
SUITE_ADD_TEST(suite, test_remspace_leadtrailspace);
return suite;
}
int main(void) {
CuString* output = CuStringNew();
CuSuite* suite = CuSuiteNew();
CuSuiteAddSuite(suite, remspace_suite());
CuSuiteRun(suite);
CuSuiteSummary(suite, output);
CuSuiteDetails(suite, output);
printf("%s\n", output->buffer);
return 0;
}
#endif
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