initial

.gitignore

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+*.o
+wsort

Makefile

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+CC=gcc
+
+CFLAGS=-Wall
+LDFLAGS=
+
+REFCNT:=$(shell git rev-list --all --count) 
+VERSION:=$(shell cat VERSION)
+
+.PHONY: all
+all:	wsort
+
+wsort:	wsort.o readwords.o
+	$(CC) -o $@ $(LDFLAGS) $^
+
+version.o:	version.c VERSION
+	$(CC) -DD_REFCNT=$(REFCNT) -DD_VERSION=\"$(VERSION)\" -c $<
+
+.c.o:
+	$(CC) $(CFLAGS) -c $<
+
+.PHONY: clean
+clean:
+	-rm -f *.o wsort
+

VERSION

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+1.0

readme.md

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+* zu jedem malloc braucht es ein free
+* Speicherfreigaben mit valgrind prüfen!!

readwords.c

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+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+
+#define MAX_CHARS_PER_LINE 100
+
+extern FILE *stdin;
+
+
+char *myfgets(char *s, int size, FILE *stream) {
+    int cnt = 0;
+    memset(s, 0, size);
+    while (1) {
+        printf("cnt: %d\n", cnt);
+        int i = fgetc(stream);
+        if ((i >= 0) && (cnt < size)) {
+            s[cnt] = i;
+        }
+        cnt += 1;
+        if ((i == '\r') || (i == '\n')) {
+            s[cnt] = 0;
+            break;
+        }
+    }
+    return s;
+}
+
+
+void readwords() {
+    while (1) {
+        char *buf = malloc(MAX_CHARS_PER_LINE 
+                           + 1 // one too many, to recognize too to many chars per line
+                           + 2 // CRLF
+                           + 1); // terminated null
+        if (myfgets(buf, MAX_CHARS_PER_LINE + 1, stdin)) { // one more for CRLF
+            if ((buf[strlen(buf)-1] == '\n') || (buf[strlen(buf)-1] == '\r')) {
+                buf[strlen(buf)-1] = 0;
+                printf("strip CR or LF\n");
+            }
+            if ((buf[strlen(buf)-1] == '\n') || (buf[strlen(buf)-1] == '\r')) {
+                buf[strlen(buf)-1] = 0;
+                printf("strip CR or LF\n");
+            }
+            printf("read a line\n");
+            printf("<%s>\n", buf);
+            printf("strlen: %ld\n", strlen(buf));
+
+            if (strlen(buf) == 0) {
+                printf("empty line, to be ignored or to end input\n");
+                break;
+            }
+            if (strlen(buf) > MAX_CHARS_PER_LINE) {
+                printf("too many chars per line, error\n");
+                fflush(stdin); // skip all overflowing chars instead of postponing them to the next fgets call
+            }
+        } else {
+            printf("fgets returns null\n");
+        }
+    }    
+}

readwords.h

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+#ifndef _READWORDS_H_
+#define _READWORDS_H_
+
+
+void readwords();
+
+
+#endif // _READWORDS_H_
+

version.c

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+#include <stdint.h>
+
+const uint32_t REFCNT = D_REFCNT;
+const char VERSION[] = D_VERSION;
+
+

wsort.c

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+#include "readwords.h"
+
+int main() {
+    readwords();
+}