demo de strtok

code/C/.gitignore

@@ -1 +1,2 @@
 fgets-simple
+demo-strtok

code/C/Makefile

@@ -2,6 +2,8 @@
 # exemples pour le chapitre sur le C
 # new Sat Feb 11 12:06:34 CET 2023
 
+all:	no-op slowprint fgets-simple
+
 no-op:			no-op.c Makefile
 	gcc -Wall $< -o $@
 
@@ -11,3 +13,5 @@ slowprint:		slowprint.c Makefile
 fgets-simple:		fgets-simple.c Makefile
 	gcc -Wall $< -o $@
 
+demo-strtok:		demo-strtok.c Makefile
+	gcc -Wall $< -o $@

code/C/demo-strtok.c

@@ -0,0 +1,52 @@
+/*
+ *	demo strtok 
+ */
+
+#include   <stdio.h>
+#include   <string.h>
+#include   <ctype.h>
+/*---------------------------------------------------------------------*/
+
+void dump_line(char *titre, char *ligne, int combien)
+{
+int		foo;
+unsigned char	*ptr;
+
+printf("   --- %s\n", titre);
+ptr = (unsigned char *)ligne;
+for (foo=0; foo<combien; foo++) {
+	printf("%02x ", ptr[foo]);
+	}
+puts("");
+for (foo=0; foo<combien; foo++) {
+	printf(" %c ", isprint(ptr[foo]) ? ptr[foo] : '?');
+	}
+puts("");
+}
+/*---------------------------------------------------------------------*/
+
+int main(int argc, char *argv[])
+{
+char		input[] = "foo bar quux quiz";
+char		*cptr, *copie;
+int		foo;
+
+dump_line("original", input, sizeof(input));
+copie = strdup(input);
+dump_line("copie", copie, sizeof(input));
+puts("");
+
+cptr = strtok(copie, " \t");
+dump_line("1er strtok", copie, sizeof(input));
+printf("   got [%s]\n", cptr);
+puts("");
+
+cptr = strtok(NULL, " \t");
+cptr = strtok(NULL, " \t");
+dump_line("2eme & 3me strtok", copie, sizeof(input));
+foo = cptr - copie;
+printf("   index = %d\n", foo);
+printf("   and we have [%s]\n", input+foo);
+return 0;
+}
+/*---------------------------------------------------------------------*/

code/C/fgets-simple.c

@@ -1,14 +1,14 @@
 /*
- *		exemple utilisation 'fgets'
+ *		exemple d'utilisation de 'fgets'
  */
 #include  <stdio.h>
 #include  <string.h>
-#define		TL	8
+#define		TL	12
 int main(int argc, char *argv[])
 {
 char		buffer[TL+1];
 while( fgets(buffer, TL, stdin) ) {
-	printf("   %4ld\n", strlen(buffer));
+	printf("   %4ld      %s\n", strlen(buffer), buffer);
 	}
 return 0;
 }

code/network/emc-tnetd.c

@@ -11,19 +11,21 @@
 #include  <arpa/inet.h>
 
 #define BINDADDR	"127.0.0.1"
-#define TL		20
+#define BINDPORT	5678
+
+#define TL		20		/* important value */
 
 int main(int argc, char *argv[])
 {
 int			foo, len, sock;
-char			*adr_ip = BINDADDR;
+char			*adr_ip  = BINDADDR;
-int			port = 5678;
+int			port     = BINDPORT;
 unsigned int		addrlen;
 int			connected;
 struct sockaddr_in	addr;
 struct in_addr		ia;
 FILE			*fpin;
-char			line[TL+5], *ptr;
+char			line[TL+5];
 
 fprintf(stderr, "--- %s ---\n", argv[0]);
 
@@ -71,7 +73,7 @@ for (;;) {
 		}
 	// fprintf(stderr, "fopened...\n");
 
-	while ( (ptr=fgets(line, TL, fpin)) ) {
+	while ( fgets(line, TL, fpin) ) {
 		len = strlen(line);
 		fprintf(stderr, "   %3d  |  %s", len, line);
 		for (foo=0; foo<len; foo++) {
@@ -79,7 +81,8 @@ for (;;) {
 			}
 		fputs("\n", fpin);
 		}
-	close(connected);
+	fclose(fpin);
+	// close(connected);
 	} /* end of the endless loop */
 
 return 0;