From 680126d7e74cebd399156cd6a7dceabf3684dd40 Mon Sep 17 00:00:00 2001
From: trenary2 <trenary@wmich.edu>
Date: Wed, 18 Oct 2017 06:54:49 -0400
Subject: [PATCH] a3
---
LowerHalf.c | 16 +++++++++++
Up.c | 17 ++++++++++++
makeargv.c | 79 +++++++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 112 insertions(+)
create mode 100644 LowerHalf.c
create mode 100644 Up.c
create mode 100644 makeargv.c
diff --git a/LowerHalf.c b/LowerHalf.c
new file mode 100644
index 0000000..dc262c7
--- /dev/null
+++ b/LowerHalf.c
@@ -0,0 +1,16 @@
+#include <stdio.h> // Steven's Figure 15.14 "UpCase"
+#include "apue.h" // modified to lower the last half
+int main()
+{ int c;
+
+ while (( c = getchar()) != EOF)
+ { if ( islower(c))
+ c = toupper(c);
+ if (c >= 'M') c = tolower(c);
+ if (putchar(c) == EOF)
+ err_sys("output error in upcase\n");
+ if (c == '\n')
+ fflush(stdout);
+ }
+ exit(0);
+}
diff --git a/Up.c b/Up.c
new file mode 100644
index 0000000..c8f842d
--- /dev/null
+++ b/Up.c
@@ -0,0 +1,17 @@
+#include <stdio.h> // Steven's Figure 15.14 "UpCase"
+#include "apue.h"
+#include <ctype.h>
+
+int main()
+{ int c;
+
+ while (( c = getchar()) != EOF)
+ { if ( islower(c))
+ c = toupper(c);
+ if (putchar(c) == EOF)
+ err_sys("output error in upcase\n");
+ if (c == '\n')
+ fflush(stdout);
+ }
+ exit(0);
+}
diff --git a/makeargv.c b/makeargv.c
new file mode 100644
index 0000000..00a446a
--- /dev/null
+++ b/makeargv.c
@@ -0,0 +1,79 @@
+// makeargv.c
+// takes a null terminated string s, and a string of delimiters and returns
+// an array of char * pointers, leaving argvp pointing to that array.
+// each of the array locations points to a null terminated "token" found in s
+// defined by the delimiter array. The number of tokens found is returned by makeargv
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+/*
+ * Make argv array (*argvp) for tokens in s which are separated by
+ * delimiters. Return -1 on error or the number of tokens otherwise.
+ */
+int makeargv(char * s, char * delimiters, char *** argvp)
+{
+ char * t;
+ char * snew;
+ int numtokens;
+ int i;
+
+ /* snew is real start of string after skipping leading delimiters */
+ snew = s + strspn(s, delimiters); //very clever
+ //printf("s = %s\n", s);
+ //printf("delimiters = %s\n", delimiters);
+ //printf("strspn = %d\n", (int) strspn(s, delimiters));
+ //printf("snew = %s\n", snew);
+
+ /* create space for a copy of snew in t */
+ if ((t = calloc(strlen(snew) + 1, sizeof(char))) == NULL) //only true if no
+ //more memory
+ {
+ *argvp = NULL;
+ numtokens = -1;
+ }
+ else
+ { /* count the number of tokens in snew */
+ strcpy(t, snew);
+
+ if (strtok(t, delimiters) == NULL)
+ numtokens = 0;
+ else
+ for (numtokens = 1; strtok(NULL, delimiters) != NULL; numtokens++); // THE work is in the For Construct
+ //^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ //start at 1 and move to the next,
+ // if its null stop
+ // else increment and move to the next
+
+ /* create an argument array to contain ptrs to tokens */
+ if ((*argvp = calloc(numtokens + 1, sizeof(char *))) == NULL)
+ //^Notice the dereferencing //Again only true if
+ //no more memory
+ {
+ free(t);
+ numtokens = -1;
+ }
+ else
+ { /* insert pointers to tokens into the array */
+ if (numtokens > 0)
+ {
+ strcpy(t, snew);
+ **argvp = strtok(t, delimiters); //set the first token
+ // printf("1 = %s\n", **argvp);
+
+ for (i = 1; i < numtokens + 1; i++)
+ {
+ *((*argvp) + i) = strtok(NULL, delimiters);
+ //^^^^^^^^^^^^^^^^ set the other tokens
+ // printf("%d = %s\n", i, *((*argvp) + i));
+ }
+ }
+ else
+ {
+ **argvp = NULL;
+ free(t);
+ }
+ }
+ }
+
+ return numtokens;
+}
--
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