program7_13.c

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/* Program 7.13 Generalizing string input */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

const size_t BUFFER_LEN = 128;              /* Length of input buffer    */
const size_t NUM_P = 100;                   /* maximum number of strings */

int main(void)
{
  char buffer[BUFFER_LEN];                  /* Input buffer             */
  char *pS[NUM_P] = { NULL };               /* Array of string pointers */
  char *pbuffer = buffer;                   /* Pointer to buffer        */
  int i = 0;                                /* Loop counter             */

  printf("\nYou can enter up to %u messages each up to %u characters.",
                                                  NUM_P, BUFFER_LEN-1);

  for(i = 0 ; i<NUM_P ; i++)
  {
    pbuffer = buffer ; /* Set pointer to beginning of buffer */
    printf("\nEnter %s message, or press Enter to end\n",
                                                           i>0? "another" : "a");

    /* Read a string of up to BUFFER_LEN characters */
    while((pbuffer - buffer < BUFFER_LEN-1) &&
           ((*pbuffer++ = getchar()) != '\n'));

    /* check for empty line indicating end of input */
    if((pbuffer - buffer) < 2)
      break;

    /* Check for string too long */
    if((pbuffer - buffer) == BUFFER_LEN && *(pbuffer-1)!= '\n')
    {
      printf("String too long - maximum %d characters allowed.",
                                                      BUFFER_LEN);
      i--;
      continue;
    }
    *(pbuffer - 1) = '\0';                  /* Add terminator             */

    pS[i] = (char*)malloc(pbuffer-buffer);  /* Get memory for string      */
    if(pS[i] == NULL)                       /* Check we actually got some