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;
+}
+/*---------------------------------------------------------------------*/