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include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
 
void exit_if_null(void *ptr, const char *msg);
int string_cmp(const void *x1, const void *x2);
 
int
main(int argc, char *argv[]) {
	FILE *filename;
	char *buffer = NULL;
	char *file = NULL;
	int str_size = 1, word_len = 0;
	int ch, file_len = 0, file_size = 1;
	char **names = NULL;
	int name_count = 0, name_size = 1, i;
 
	file = malloc(file_size * sizeof(*file));
	exit_if_null(file, "File Allocation");
 
	if (argc < 2) {
		printf("Enter filename: ");
		while ((ch = getchar()) != '\n') {
			if (file_size == file_len) {
				file_size *= 2;
				file = realloc(file, file_size * sizeof(*file));
				exit_if_null(file, "Reallocation");
			}
			file[file_len++] = ch;
		}
		file[file_len] = '\0';
		filename = fopen(file, "r");
	} else {
		filename = fopen(argv[1], "r");
	}
 
	if (filename) {
		names = malloc(name_size * sizeof(*names));
		exit_if_null(names, "String Array Allocation");
 
		buffer = malloc((str_size+1) * sizeof(*buffer));
		exit_if_null(buffer, "Name Initial Allocation");
 
		while ((ch = getc(filename)) != EOF) {
			if (isalpha(ch)) {
				if (str_size == word_len) {
					str_size *= 2;
					buffer = realloc(buffer, str_size * sizeof(*buffer));
					exit_if_null(buffer, "Reallocation");
 
				}
				buffer[word_len++] = ch;
			}
 
			if (ch == '\n') {
				buffer[word_len] = '\0';
				if (name_size == name_count) {
					name_size *= 2;
					names = realloc(names, name_size * sizeof(*names));
					exit_if_null(names, "Reallocation");
				}
				names[name_count] = malloc(strlen(buffer)+1);
				exit_if_null(names[name_count], "Allocation");
 
				strcpy(names[name_count], buffer);
 
				name_count++;
				str_size = 1;
				word_len = 0;
			}
		}
		free(buffer);
 
	} else {
		fprintf(stderr, "Error reading from file!\n");
		exit(EXIT_FAILURE);
	}
 
	qsort(names, name_count, sizeof(*names), string_cmp);
 
	for (i = 0; i < name_count; i++) {
		printf("%s\n", names[i]);
	}
 
	for (i = 0; i < name_count; i++) {
		free(names[i]);
	}
	free(names);
	free(file);
	return 0;
}
 
int
string_cmp(const void *x1, const void *x2) {
	return strcmp(*(char**)x1, *(char**)x2);
}
 
void
exit_if_null(void *ptr, const char *msg) {
    if (!ptr) {
        printf("Unexpected null pointer: %s\n", msg);
        exit(EXIT_FAILURE);
    }
}

prog.c:1:9: error: expected '=', ',', ';', 'asm' or '__attribute__' before '<' token
 include <stdio.h>
         ^
In file included from prog.c:2:0:
/usr/include/stdlib.h:139:8: error: unknown type name 'size_t'
 extern size_t __ctype_get_mb_cur_max (void) __THROW __wur;
        ^
/usr/include/stdlib.h:466:22: error: unknown type name 'size_t'
 extern void *malloc (size_t __size) __THROW __attribute_malloc__ __wur;
                      ^
/usr/include/stdlib.h:468:22: error: unknown type name 'size_t'
 extern void *calloc (size_t __nmemb, size_t __size)
                      ^
/usr/include/stdlib.h:468:38: error: unknown type name 'size_t'
 extern void *calloc (size_t __nmemb, size_t __size)
                                      ^
/usr/include/stdlib.h:480:36: error: unknown type name 'size_t'
 extern void *realloc (void *__ptr, size_t __size)
                                    ^
/usr/include/stdlib.h:509:29: error: unknown type name 'size_t'
 extern void *aligned_alloc (size_t __alignment, size_t __size)
                             ^
/usr/include/stdlib.h:509:49: error: unknown type name 'size_t'
 extern void *aligned_alloc (size_t __alignment, size_t __size)
                                                 ^
/usr/include/stdlib.h:756:9: error: unknown type name 'size_t'
         size_t __nmemb, size_t __size, __compar_fn_t __compar)
         ^
/usr/include/stdlib.h:756:25: error: unknown type name 'size_t'
         size_t __nmemb, size_t __size, __compar_fn_t __compar)
                         ^
In file included from /usr/include/stdlib.h:760:0,
                 from prog.c:2:
/usr/include/i386-linux-gnu/bits/stdlib-bsearch.h:20:49: error: unknown type name 'size_t'
 bsearch (const void *__key, const void *__base, size_t __nmemb, size_t __size,
                                                 ^
/usr/include/i386-linux-gnu/bits/stdlib-bsearch.h:20:65: error: unknown type name 'size_t'
 bsearch (const void *__key, const void *__base, size_t __nmemb, size_t __size,
                                                                 ^
In file included from prog.c:2:0:
/usr/include/stdlib.h:765:34: error: unknown type name 'size_t'
 extern void qsort (void *__base, size_t __nmemb, size_t __size,
                                  ^
/usr/include/stdlib.h:765:50: error: unknown type name 'size_t'
 extern void qsort (void *__base, size_t __nmemb, size_t __size,
                                                  ^
/usr/include/stdlib.h:863:36: error: unknown type name 'size_t'
 extern int mblen (const char *__s, size_t __n) __THROW;
                                    ^
/usr/include/stdlib.h:867:34: error: unknown type name 'size_t'
      const char *__restrict __s, size_t __n) __THROW;
                                  ^
/usr/include/stdlib.h:874:8: error: unknown type name 'size_t'
 extern size_t mbstowcs (wchar_t *__restrict  __pwcs,
        ^
/usr/include/stdlib.h:875:32: error: unknown type name 'size_t'
    const char *__restrict __s, size_t __n) __THROW;
                                ^
/usr/include/stdlib.h:877:8: error: unknown type name 'size_t'
 extern size_t wcstombs (char *__restrict __s,
        ^
/usr/include/stdlib.h:878:38: error: unknown type name 'size_t'
    const wchar_t *__restrict __pwcs, size_t __n)
                                      ^
In file included from prog.c:3:0:
/usr/include/string.h:47:8: error: unknown type name 'size_t'
        size_t __n) __THROW __nonnull ((1, 2));
        ^
/usr/include/string.h:50:56: error: unknown type name 'size_t'
 extern void *memmove (void *__dest, const void *__src, size_t __n)
                                                        ^
/usr/include/string.h:66:42: error: unknown type name 'size_t'
 extern void *memset (void *__s, int __c, size_t __n) __THROW __nonnull ((1));
                                          ^
/usr/include/string.h:69:56: error: unknown type name 'size_t'
 extern int memcmp (const void *__s1, const void *__s2, size_t __n)
                                                        ^
/usr/include/string.h:96:48: error: unknown type name 'size_t'
 extern void *memchr (const void *__s, int __c, size_t __n)
                                                ^
/usr/include/string.h:133:39: error: unknown type name 'size_t'
         const char *__restrict __src, size_t __n)
                                       ^
/usr/include/string.h:141:9: error: unknown type name 'size_t'
         size_t __n) __THROW __nonnull ((1, 2));
         ^
/usr/include/string.h:147:57: error: unknown type name 'size_t'
 extern int strncmp (const char *__s1, const char *__s2, size_t __n)
                                                         ^
/usr/include/string.h:154:8: error: unknown type name 'size_t'
 extern size_t strxfrm (char *__restrict __dest,
        ^
/usr/include/string.h:155:40: error: unknown type name 'size_t'
          const char *__restrict __src, size_t __n)
                                        ^
/usr/include/string.h:285:8: error: unknown type name 'size_t'
 extern size_t strcspn (const char *__s, const char *__reject)
        ^
/usr/include/string.h:289:8: error: unknown type name 'size_t'
 extern size_t strspn (const char *__s, const char *__accept)
        ^
/usr/include/string.h:399:8: error: unknown type name 'size_t'
 extern size_t strlen (const char *__s)
        ^
/usr/include/string.h:451:33: error: unknown type name 'size_t'
 extern void __bzero (void *__s, size_t __n) __THROW __nonnull ((1));
                                 ^
In file included from /usr/include/string.h:635:0,
                 from prog.c:3:
/usr/include/i386-linux-gnu/bits/string2.h:945:17: error: unknown type name 'size_t'
 __STRING_INLINE size_t __strcspn_c1 (const char *__s, int __reject);
                 ^
/usr/include/i386-linux-gnu/bits/string2.h:946:17: error: unknown type name 'size_t'
 __STRING_INLINE size_t
                 ^
/usr/include/i386-linux-gnu/bits/string2.h: In function '__strcspn_c1':
/usr/include/i386-linux-gnu/bits/string2.h:949:3: error: unknown type name 'size_t'
   size_t __result = 0;
   ^
/usr/include/i386-linux-gnu/bits/string2.h: At top level:
/usr/include/i386-linux-gnu/bits/string2.h:955:17: error: unknown type name 'size_t'
 __STRING_INLINE size_t __strcspn_c2 (const char *__s, int __reject1,
                 ^
/usr/include/i386-linux-gnu/bits/string2.h:957:17: error: unknown type name 'size_t'
 __STRING_INLINE size_t
                 ^
/usr/include/i386-linux-gnu/bits/string2.h: In function '__strcspn_c2':
/usr/include/i386-linux-gnu/bits/string2.h:960:3: error: unknown type name 'size_t'
   size_t __result = 0;
   ^
/usr/include/i386-linux-gnu/bits/string2.h: At top level:
/usr/include/i386-linux-gnu/bits/string2.h:967:17: error: unknown type name 'size_t'
 __STRING_INLINE size_t __strcspn_c3 (const char *__s, int __reject1,
                 ^
/usr/include/i386-linux-gnu/bits/string2.h:969:17: error: unknown type name 'size_t'
 __STRING_INLINE size_t
                 ^
/usr/include/i386-linux-gnu/bits/string2.h: In function '__strcspn_c3':
/usr/include/i386-linux-gnu/bits/string2.h:973:3: error: unknown type name 'size_t'
   size_t __result = 0;
   ^
/usr/include/i386-linux-gnu/bits/string2.h: At top level:
/usr/include/i386-linux-gnu/bits/string2.h:1021:17: error: unknown type name 'size_t'
 __STRING_INLINE size_t __strspn_c1 (const char *__s, int __accept);
                 ^
/usr/include/i386-linux-gnu/bits/string2.h:1022:17: error: unknown type name 'size_t'
 __STRING_INLINE size_t
                 ^
/usr/include/i386-linux-gnu/bits/string2.h: In function '__strspn_c1':
/usr/include/i386-linux-gnu/bits/string2.h:1025:3: error: unknown type name 'size_t'
   size_t __result = 0;
   ^
/usr/include/i386-linux-gnu/bits/string2.h: At top level:
/usr/include/i386-linux-gnu/bits/string2.h:1032:17: error: unknown type name 'size_t'
 __STRING_INLINE size_t __strspn_c2 (const char *__s, int __accept1,
                 ^
/usr/include/i386-linux-gnu/bits/string2.h:1034:17: error: unknown type name 'size_t'
 __STRING_INLINE size_t
                 ^
/usr/include/i386-linux-gnu/bits/string2.h: In function '__strspn_c2':
/usr/include/i386-linux-gnu/bits/string2.h:1037:3: error: unknown type name 'size_t'
   size_t __result = 0;
   ^
/usr/include/i386-linux-gnu/bits/string2.h: At top level:
/usr/include/i386-linux-gnu/bits/string2.h:1044:17: error: unknown type name 'size_t'
 __STRING_INLINE size_t __strspn_c3 (const char *__s, int __accept1,
                 ^
/usr/include/i386-linux-gnu/bits/string2.h:1046:17: error: unknown type name 'size_t'
 __STRING_INLINE size_t
                 ^
/usr/include/i386-linux-gnu/bits/string2.h: In function '__strspn_c3':
/usr/include/i386-linux-gnu/bits/string2.h:1049:3: error: unknown type name 'size_t'
   size_t __result = 0;
   ^
/usr/include/i386-linux-gnu/bits/string2.h: In function '__strpbrk_c2':
/usr/include/i386-linux-gnu/bits/string2.h:1105:42: error: 'size_t' undeclared (first use in this function)
   return *__s == '\0' ? NULL : (char *) (size_t) __s;
                                          ^
/usr/include/i386-linux-gnu/bits/string2.h:1105:42: note: each undeclared identifier is reported only once for each function it appears in
/usr/include/i386-linux-gnu/bits/string2.h:1105:50: error: expected ';' before '__s'
   return *__s == '\0' ? NULL : (char *) (size_t) __s;
                                                  ^
/usr/include/i386-linux-gnu/bits/string2.h: In function '__strpbrk_c3':
/usr/include/i386-linux-gnu/bits/string2.h:1117:42: error: 'size_t' undeclared (first use in this function)
   return *__s == '\0' ? NULL : (char *) (size_t) __s;
                                          ^
/usr/include/i386-linux-gnu/bits/string2.h:1117:50: error: expected ';' before '__s'
   return *__s == '\0' ? NULL : (char *) (size_t) __s;
                                                  ^
prog.c: In function 'main':
prog.c:11:2: error: unknown type name 'FILE'
  FILE *filename;
  ^
prog.c:19:9: warning: implicit declaration of function 'malloc' [-Wimplicit-function-declaration]
  file = malloc(file_size * sizeof(*file));
         ^
prog.c:19:9: warning: incompatible implicit declaration of built-in function 'malloc'
prog.c:19:9: note: include '<stdlib.h>' or provide a declaration of 'malloc'
prog.c:23:3: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
   printf("Enter filename: ");
   ^
prog.c:23:3: warning: incompatible implicit declaration of built-in function 'printf'
prog.c:23:3: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:24:16: warning: implicit declaration of function 'getchar' [-Wimplicit-function-declaration]
   while ((ch = getchar()) != '\n') {
                ^
prog.c:27:12: warning: implicit declaration of function 'realloc' [-Wimplicit-function-declaration]
     file = realloc(file, file_size * sizeof(*file));
            ^
prog.c:27:12: warning: incompatible implicit declaration of built-in function 'realloc'
prog.c:27:12: note: include '<stdlib.h>' or provide a declaration of 'realloc'
prog.c:33:14: warning: implicit declaration of function 'fopen' [-Wimplicit-function-declaration]
   filename = fopen(file, "r");
              ^
prog.c:33:12: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
   filename = fopen(file, "r");
            ^
prog.c:35:12: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
   filename = fopen(argv[1], "r");
            ^
prog.c:45:16: warning: implicit declaration of function 'getc' [-Wimplicit-function-declaration]
   while ((ch = getc(filename)) != EOF) {
                ^
prog.c:45:35: error: 'EOF' undeclared (first use in this function)
   while ((ch = getc(filename)) != EOF) {
                                   ^
prog.c:49:15: warning: incompatible implicit declaration of built-in function 'realloc'
      buffer = realloc(buffer, str_size * sizeof(*buffer));
               ^
prog.c:49:15: note: include '<stdlib.h>' or provide a declaration of 'realloc'
prog.c:60:14: warning: incompatible implicit declaration of built-in function 'realloc'
      names = realloc(names, name_size * sizeof(*names));
              ^
prog.c:60:14: note: include '<stdlib.h>' or provide a declaration of 'realloc'
prog.c:76:3: warning: implicit declaration of function 'fprintf' [-Wimplicit-function-declaration]
   fprintf(stderr, "Error reading from file!\n");
   ^
prog.c:76:3: warning: incompatible implicit declaration of built-in function 'fprintf'
prog.c:76:3: note: include '<stdio.h>' or provide a declaration of 'fprintf'
prog.c:76:11: error: 'stderr' undeclared (first use in this function)
   fprintf(stderr, "Error reading from file!\n");
           ^
prog.c:80:2: warning: implicit declaration of function 'qsort' [-Wimplicit-function-declaration]
  qsort(names, name_count, sizeof(*names), string_cmp);
  ^
prog.c:83:3: warning: incompatible implicit declaration of built-in function 'printf'
   printf("%s\n", names[i]);
   ^
prog.c:83:3: note: include '<stdio.h>' or provide a declaration of 'printf'
In file included from /usr/include/string.h:635:0,
                 from prog.c:3:
prog.c: In function 'string_cmp':
prog.c:96:9: error: unknown type name 'size_t'
  return strcmp(*(char**)x1, *(char**)x2);
         ^
prog.c:96:9: error: 'size_t' undeclared (first use in this function)
  return strcmp(*(char**)x1, *(char**)x2);
         ^
prog.c:96:9: error: expected expression before 'const'
  return strcmp(*(char**)x1, *(char**)x2);
         ^
prog.c:96:9: error: expected expression before 'const'
  return strcmp(*(char**)x1, *(char**)x2);
         ^
prog.c:96:9: error: expected expression before 'const'
  return strcmp(*(char**)x1, *(char**)x2);
         ^
prog.c:96:9: error: expected expression before 'const'
  return strcmp(*(char**)x1, *(char**)x2);
         ^
prog.c:96:9: error: expected expression before 'const'
  return strcmp(*(char**)x1, *(char**)x2);
         ^
prog.c:96:9: error: expected expression before 'const'
  return strcmp(*(char**)x1, *(char**)x2);
         ^
prog.c:96:9: error: expected expression before 'const'
  return strcmp(*(char**)x1, *(char**)x2);
         ^
prog.c:96:9: error: expected expression before 'const'
  return strcmp(*(char**)x1, *(char**)x2);
         ^
prog.c:96:9: error: expected expression before 'const'
  return strcmp(*(char**)x1, *(char**)x2);
         ^
prog.c:96:9: error: expected expression before 'const'
  return strcmp(*(char**)x1, *(char**)x2);
         ^
prog.c:96:9: error: expected expression before 'const'
  return strcmp(*(char**)x1, *(char**)x2);
         ^
prog.c:96:9: error: expected expression before 'const'
  return strcmp(*(char**)x1, *(char**)x2);
         ^
prog.c: In function 'exit_if_null':
prog.c:102:9: warning: incompatible implicit declaration of built-in function 'printf'
         printf("Unexpected null pointer: %s\n", msg);
         ^
prog.c:102:9: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c: In function 'string_cmp':
prog.c:97:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

Standard output is empty