ctype.h, getenv

05/assert.h

@@ -0,0 +1,7 @@
+#ifndef _ASSERT_H
+#define _ASSERT_H
+
+// assert is defined in stdc_common.h
+#include <stdc_common.h>
+
+#endif // _ASSERT_H

05/ctype.h

@@ -0,0 +1,92 @@
+#ifndef _CTYPE_H
+#define _CTYPE_H
+
+#include <stdc_common.h>
+
+int islower(int c) {
+	return c >= 'a' && c <= 'z';
+}
+
+int isupper(int c) {
+	return c >= 'A' && c <= 'Z';
+}
+
+int isalpha(int c) {
+	return isupper(c) || islower(c);
+}
+
+int isalnum(int c) {
+	return isalpha(c) || isdigit(c);
+}
+
+int isprint(int c) {
+	if (isalnum(c)) return 1;
+	switch (c) {
+	case '!': return 1;
+	case '@': return 1;
+	case '#': return 1;
+	case '$': return 1;
+	case '%': return 1;
+	case '^': return 1;
+	case '&': return 1;
+	case '*': return 1;
+	case '(': return 1;
+	case ')': return 1;
+	case '-': return 1;
+	case '=': return 1;
+	case '_': return 1;
+	case '+': return 1;
+	case '`': return 1;
+	case '~': return 1;
+	case '[': return 1;
+	case '{': return 1;
+	case ']': return 1;
+	case '}': return 1;
+	case '\\': return 1;
+	case '|': return 1;
+	case ';': return 1;
+	case ':': return 1;
+	case '\'': return 1;
+	case '"': return 1;
+	case ',': return 1;
+	case '<': return 1;
+	case '.': return 1;
+	case '>': return 1;
+	case '/': return 1;
+	case '?': return 1;
+	}
+	return 0;
+}
+
+int iscntrl(int c) {
+	return !isprint(c);
+}
+
+int isgraph(int c) {
+	return isprint(c) && c != ' ';
+}
+
+int ispunct(int c) {
+	return isprint(c) && c != ' ' && !isalnum(c);
+}
+
+int isxdigit(int c) {
+	if (isdigit(c)) return 1;
+	if (c >= 'a' && c <= 'f') return 1;
+	if (c >= 'A' && c <= 'F') return 1;
+	return 0;
+}
+
+int tolower(int c) {
+	if (c >= 'A' && c <= 'Z')
+		return c - 'A' + 'a';
+	return c;
+}
+
+int toupper(int c) {
+	if (c >= 'a' && c <= 'z')
+		return c - 'a' + 'A';
+	return c;
+}
+
+#endif // _CTYPE_H

05/main.c

@@ -1,15 +1,16 @@
 #define _STDLIB_DEBUG
 #include <stdio.h>
 #include <string.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <ctype.h>
 
-int main(void) {
-         int count; float quant; char units[21], item[21];
-         while (!feof(stdin) && !ferror(stdin)) {
-                  count = fscanf(stdin, "%f%20s of %20s",
-                           &quant, units, item);
-                  fscanf(stdin,"%*[^\n]");
-                  printf("%d %g %s %s\n", count, quant, units, item);
-         }
+typedef struct {
+	int x;
+	long y;
+} S;
+
+int main(int argc, char **argv) {
 	return 0;
 }
 

05/stdc_common.h

@@ -431,10 +431,14 @@ double strtod(const char *nptr, char **endptr) {
 
 int main();
 
+static char **_envp;
+
 int _main(int argc, char **argv) {
 	int i;
 	_Float p = {1, 0};
 	
+	_envp = argv + argc + 1; // this is where the environment variables will be
+	
 	stdin = &_stdin;
 	stdout = &_stdout;
 	stderr = &_stderr;

05/stddef.h

@@ -0,0 +1,8 @@
+#ifndef _STDDEF_H
+#define _STDDEF_H
+
+#include <stdc_common.h>
+#define offsetof(struct, member) ((size_t)(&((struct *)NULL)->member))
+// @NONSTANDARD: we don't have wchar_t
+
+#endif // _STDDEF_H

05/stdio.h

@@ -1751,7 +1751,7 @@ FILE *tmpfile(void) {
 	return _FILE_from_fd(fd);
 }
 
-int fgetc(FILE *stream) {
+int getc(FILE *stream) {
 	unsigned char c;
 	long n;
 	if (stream->eof) return EOF;
@@ -1760,7 +1760,9 @@ int fgetc(FILE *stream) {
 	return c;
 }
 
-#define getc(fp) fgetc(fp)
+int fgetc(FILE *stream) {
+	return getc(stream);
+}
 
 char *fgets(char *s, int n, FILE *stream) {
 	char *p = s, *end = p + (n-1);
@@ -1786,12 +1788,15 @@ char *fgets(char *s, int n, FILE *stream) {
 	return s;
 }
 
-int fputc(int c, FILE *stream) {
+int putc(int c, FILE *stream) {
 	size_t n = fwrite(&c, 1, 1, stream);
 	if (n == 1) return c;
 	return EOF;
 }
-#define putc(c, fp) fputc(c, fp)
+
+int fputc(int c, FILE *stream) {
+	return putc(c, stream);
+}
 
 int fputs(const char *s, FILE *stream) {
 	size_t n = strlen(s);

05/stdlib.h

@@ -0,0 +1,19 @@
+#ifndef _STDLIB_H
+#define _STDLIB_H
+
+#include <stdc_common.h>
+
+char *getenv(const char *name) {
+	int i, j;
+	for (i = 0; _envp[i]; ++i) {
+		char *key = _envp[i];
+		for (j = 0; key[j] != '=' && name[j]; ++j)
+			if (name[j] != key[j])
+				break;
+		if (key[j] == '=' && !name[j])
+			return key + (j+1);
+	}
+	return NULL;
+}
+
+#endif // _STDLIB_H