From 7a38545d0b8df7216c1300b379a51fb14374a4fa Mon Sep 17 00:00:00 2001
From: Jan Sucan <jan@jansucan.com>
Date: Fri, 25 Dec 2020 12:50:00 +0100
Subject: Apply clang-format

---
 main.c | 403 ++++++++++++++++++++++++++++++++++-------------------------------
 1 file changed, 211 insertions(+), 192 deletions(-)

(limited to 'main.c')

diff --git a/main.c b/main.c
index b011d64..6968710 100644
--- a/main.c
+++ b/main.c
@@ -1,44 +1,46 @@
+#include <endian.h>
+#include <errno.h>
+#include <inttypes.h>
+#include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include <stdint.h>
-#include <inttypes.h>
 #include <string.h>
-#include <errno.h>
-#include <endian.h>
 
-#include "options.h"
-#include "resources.h"
 #include "file.h"
+#include "options.h"
 #include "print.h"
+#include "resources.h"
 
 void
 usage(int exit_code)
 {
-    printf("Usage: diff-dd [-s SECTOR_SIZE] [-b BUFFER_SIZE] [INFILE]  REFFILE  OUTFILE\n");
+    printf("Usage: diff-dd [-s SECTOR_SIZE] [-b BUFFER_SIZE] [INFILE]  REFFILE "
+           " OUTFILE\n");
     exit(exit_code);
 }
 
 void
-clean_exit(resources_t * const res, int exit_code)
+clean_exit(resources_t *const res, int exit_code)
 {
     resources_free(res);
     exit(exit_code);
 }
 
 int
-open_files(const options_t * const opts, resources_t * const res, bool is_action_backup)
+open_files(const options_t *const opts, resources_t *const res,
+           bool is_action_backup)
 {
     /* Open the input file */
     if ((opts->in_file_path != NULL) &&
-	((res->in_file = fopen(opts->in_file_path, "r")) == NULL)) {
-	print_error("cannot open input file: %s", strerror(errno));
-	return 1;
+        ((res->in_file = fopen(opts->in_file_path, "r")) == NULL)) {
+        print_error("cannot open input file: %s", strerror(errno));
+        return 1;
     }
 
     /* Open the reference file */
     if ((res->ref_file = fopen(opts->ref_file_path, "r")) == NULL) {
-	print_error("cannot open reference file: %s", strerror(errno));
-	return 1;
+        print_error("cannot open reference file: %s", strerror(errno));
+        return 1;
     }
 
     /* Open the output file
@@ -50,44 +52,45 @@ open_files(const options_t * const opts, resources_t * const res, bool is_action
 
     if (is_action_backup) {
         /* When backing up, the output file is truncated to hold the
-	 * new data
-	 */
-	out_mode[0] = 'w';
-	out_mode[1] = '\0';
+         * new data
+         */
+        out_mode[0] = 'w';
+        out_mode[1] = '\0';
     }
 
     if ((res->out_file = fopen(opts->out_file_path, out_mode)) == NULL) {
-	print_error("cannot open output file: %s", strerror(errno));
-	return 1;
+        print_error("cannot open output file: %s", strerror(errno));
+        return 1;
     }
 
     return 0;
 }
 
 bool
-is_reference_file_valid(resources_t * const res, uint32_t sector_size)
+is_reference_file_valid(resources_t *const res, uint32_t sector_size)
 {
     const long ref_size = file_size(res->ref_file);
 
     if (ref_size < 0) {
-	print_error("cannot get size of reference file: %s", strerror(errno));
-	return false;
+        print_error("cannot get size of reference file: %s", strerror(errno));
+        return false;
     } else if (ref_size == 0) {
-	print_error("reference file is empty");
-	return false;
+        print_error("reference file is empty");
+        return false;
     } else if ((ref_size % (sizeof(uint64_t) + sector_size)) != 0) {
         /* The reference file must hold equally sized sectors and the
-	 * offset of each of them
-	 */
-	print_error("reference file has size that cannot contain valid diff data");
-	return false;
+         * offset of each of them
+         */
+        print_error(
+            "reference file has size that cannot contain valid diff data");
+        return false;
     }
 
     const long out_size = file_size(res->out_file);
 
     if (out_size < 0) {
-	print_error("cannot get size of output file: %s", strerror(errno));
-	return 1;
+        print_error("cannot get size of output file: %s", strerror(errno));
+        return 1;
     }
 
     uint64_t ref_offset = 0;
@@ -95,196 +98,211 @@ is_reference_file_valid(resources_t * const res, uint32_t sector_size)
 
     /* Scan the reference file and check  */
     for (;;) {
-	uint64_t out_offset;
-	/* Read the next offset */
-	const size_t ref_read = fread(&out_offset, sizeof(out_offset), 1U, res->ref_file);
-	out_offset = le64toh(out_offset);
-
-	if (feof(res->ref_file)) {
-	    break;
-	} else if ((ref_read != 1U) || ferror(res->ref_file)) {
-    	    print_error("cannot read from reference file: %s", strerror(errno));
-	    return false;
-    	} else if (((ref_offset != 0) && (out_offset <= prev_out_offset)) ||
-		   ((out_offset + sector_size) > out_size)) {
-	    /* The offset must be higher than the previous one and it
-	     * must point into the file
-	     */
-	    print_error("reference file is not valid");
-	    return false;
-	} else if (fseek(res->ref_file, sector_size, SEEK_CUR) != 0) {
-	    print_error("cannot seek in reference file: %s", strerror(errno));
-	    return false;
-	}
-
-	prev_out_offset = out_offset;
+        uint64_t out_offset;
+        /* Read the next offset */
+        const size_t ref_read =
+            fread(&out_offset, sizeof(out_offset), 1U, res->ref_file);
+        out_offset = le64toh(out_offset);
+
+        if (feof(res->ref_file)) {
+            break;
+        } else if ((ref_read != 1U) || ferror(res->ref_file)) {
+            print_error("cannot read from reference file: %s", strerror(errno));
+            return false;
+        } else if (((ref_offset != 0) && (out_offset <= prev_out_offset)) ||
+                   ((out_offset + sector_size) > out_size)) {
+            /* The offset must be higher than the previous one and it
+             * must point into the file
+             */
+            print_error("reference file is not valid");
+            return false;
+        } else if (fseek(res->ref_file, sector_size, SEEK_CUR) != 0) {
+            print_error("cannot seek in reference file: %s", strerror(errno));
+            return false;
+        }
+
+        prev_out_offset = out_offset;
     }
 
     if (ftell(res->ref_file) != ref_size) {
         /* The reference file must be read completely */
-	print_error("reference file is not valid");
-	return false;
+        print_error("reference file is not valid");
+        return false;
     } else if (fseek(res->ref_file, 0L, SEEK_SET) != 0) {
         /* The file must be prepared for the restoring */
-	print_error("cannot seek in reference file: %s", strerror(errno));
-	return false;
+        print_error("cannot seek in reference file: %s", strerror(errno));
+        return false;
     }
 
     return true;
 }
 
 int
-diff_backup(const options_t * const opts, resources_t * const res)
+diff_backup(const options_t *const opts, resources_t *const res)
 {
     const long in_size = file_size(res->in_file);
 
     if (in_size < 0) {
-	print_error("cannot get size of input file: %s", strerror(errno));
-	return 1;
+        print_error("cannot get size of input file: %s", strerror(errno));
+        return 1;
     }
 
     const long ref_size = file_size(res->ref_file);
 
     if (ref_size < 0) {
-	print_error("cannot get size of reference file: %s", strerror(errno));
-	return 1;
+        print_error("cannot get size of reference file: %s", strerror(errno));
+        return 1;
     }
 
     /* Check sizes of the input file and the reference file */
     if (in_size != ref_size) {
-	print_error("input file and reference file differ in size");
-	return 1;
+        print_error("input file and reference file differ in size");
+        return 1;
     } else if ((in_size % opts->sector_size) != 0) {
-	print_error("size of input file and reference file is not multiple of"PRIu32, opts->sector_size);
-	return 1;
+        print_error(
+            "size of input file and reference file is not multiple of" PRIu32,
+            opts->sector_size);
+        return 1;
     }
 
     /* Allocate the buffers */
     /* The output buffer contains also the offsets */
-    const size_t out_buffer_size = ((opts->buffer_size / opts->sector_size) * sizeof(uint64_t)) +
-	opts->buffer_size;
-
-    if ((res->in_buffer = (char *) malloc(opts->buffer_size)) == NULL) {
-	print_error("cannot allocate buffer for input file data");
-	return 1;
-    } else if ((res->ref_buffer = (char *) malloc(opts->buffer_size)) == NULL) {
-   	print_error("cannot allocate buffer for reference file data");
-	return 1;
-    } else if ((res->out_buffer = (char *) malloc(out_buffer_size)) == NULL) {
-   	print_error("cannot allocate buffer for output file data");
-	return 1;
+    const size_t out_buffer_size =
+        ((opts->buffer_size / opts->sector_size) * sizeof(uint64_t)) +
+        opts->buffer_size;
+
+    if ((res->in_buffer = (char *)malloc(opts->buffer_size)) == NULL) {
+        print_error("cannot allocate buffer for input file data");
+        return 1;
+    } else if ((res->ref_buffer = (char *)malloc(opts->buffer_size)) == NULL) {
+        print_error("cannot allocate buffer for reference file data");
+        return 1;
+    } else if ((res->out_buffer = (char *)malloc(out_buffer_size)) == NULL) {
+        print_error("cannot allocate buffer for output file data");
+        return 1;
     }
 
     size_t out_buffer_index = 0;
     uint64_t offset = 0;
 
     for (;;) {
-    	/* Read the sectors from the input file to the buffer */
-    	const size_t in_read = fread(res->in_buffer, 1U, opts->buffer_size, res->in_file);
-
-    	if ((in_read % opts->sector_size) != 0) {
-	    print_error("data read from input file is not multiple of sector size");
-	    return 1;
-    	} else if (ferror(res->in_file)) {
-    	    print_error("cannot read from input file: %s", strerror(errno));
-	    return 1;
-    	}
-
-    	/* Read sectors from the reference file to the buffer */
-    	const size_t ref_read = fread(res->ref_buffer, 1U, opts->buffer_size, res->ref_file);
-
-    	if ((ref_read % opts->sector_size) != 0) {
-	    print_error("data read from reference file is not multiple of sector size");
-	    return 1;
-    	} else if (ferror(res->ref_file)) {
-    	    print_error("%s", strerror(errno));
-	    return 1;
-    	}
-
-	if (in_read != ref_read) {
-	    print_error("data read from input file and reference file differ in size");
-	    return 1;
-	}
-
-    	/* Process sectors in the buffer */
-    	for (size_t i = 0; i < in_read; i += opts->sector_size) {
-	    /* Compare the sectors  */
-    	    int changed = 0;
-    	    const size_t j_end = i + opts->sector_size;
-    	    for (size_t j = i; j < j_end; ++j) {
-    		if (res->in_buffer[j] != res->ref_buffer[j]) {
-    		    changed = 1;
-    		    break;
-    		}
-    	    }
-
-    	    if (changed) {
-    		/* Write changed sector */
-		if (out_buffer_index >= out_buffer_size) {
-		    /* The output buffer is full. Write it to the
-		     * output file.
-		     */
-		    const size_t x = fwrite(res->out_buffer, 1U, out_buffer_index, res->out_file);
-
-		    if (x != out_buffer_index) {
-			print_error("cannot write to output file: %s", strerror(errno));
-			return 1;
-		    }
-
-		    out_buffer_index = 0;
-		}
-
-    		const uint64_t o = htole64(offset);
-
-		memcpy(res->out_buffer + out_buffer_index, (void *) &o, sizeof(o));
-		memcpy(res->out_buffer + out_buffer_index, &(res->in_buffer[i]), opts->sector_size);
-		out_buffer_index += sizeof(o) + opts->sector_size;
-	    }
-
-	    offset += opts->sector_size;
-    	}
-
-    	if (feof(res->in_file)) {
-    	    break;
-    	}
+        /* Read the sectors from the input file to the buffer */
+        const size_t in_read =
+            fread(res->in_buffer, 1U, opts->buffer_size, res->in_file);
+
+        if ((in_read % opts->sector_size) != 0) {
+            print_error(
+                "data read from input file is not multiple of sector size");
+            return 1;
+        } else if (ferror(res->in_file)) {
+            print_error("cannot read from input file: %s", strerror(errno));
+            return 1;
+        }
+
+        /* Read sectors from the reference file to the buffer */
+        const size_t ref_read =
+            fread(res->ref_buffer, 1U, opts->buffer_size, res->ref_file);
+
+        if ((ref_read % opts->sector_size) != 0) {
+            print_error(
+                "data read from reference file is not multiple of sector size");
+            return 1;
+        } else if (ferror(res->ref_file)) {
+            print_error("%s", strerror(errno));
+            return 1;
+        }
+
+        if (in_read != ref_read) {
+            print_error(
+                "data read from input file and reference file differ in size");
+            return 1;
+        }
+
+        /* Process sectors in the buffer */
+        for (size_t i = 0; i < in_read; i += opts->sector_size) {
+            /* Compare the sectors  */
+            int changed = 0;
+            const size_t j_end = i + opts->sector_size;
+            for (size_t j = i; j < j_end; ++j) {
+                if (res->in_buffer[j] != res->ref_buffer[j]) {
+                    changed = 1;
+                    break;
+                }
+            }
+
+            if (changed) {
+                /* Write changed sector */
+                if (out_buffer_index >= out_buffer_size) {
+                    /* The output buffer is full. Write it to the
+                     * output file.
+                     */
+                    const size_t x = fwrite(res->out_buffer, 1U,
+                                            out_buffer_index, res->out_file);
+
+                    if (x != out_buffer_index) {
+                        print_error("cannot write to output file: %s",
+                                    strerror(errno));
+                        return 1;
+                    }
+
+                    out_buffer_index = 0;
+                }
+
+                const uint64_t o = htole64(offset);
+
+                memcpy(res->out_buffer + out_buffer_index, (void *)&o,
+                       sizeof(o));
+                memcpy(res->out_buffer + out_buffer_index, &(res->in_buffer[i]),
+                       opts->sector_size);
+                out_buffer_index += sizeof(o) + opts->sector_size;
+            }
+
+            offset += opts->sector_size;
+        }
+
+        if (feof(res->in_file)) {
+            break;
+        }
     }
 
     /* Write out the output buffer */
     if (out_buffer_index >= 0) {
-	const size_t x = fwrite(res->out_buffer, 1U, out_buffer_index, res->out_file);
+        const size_t x =
+            fwrite(res->out_buffer, 1U, out_buffer_index, res->out_file);
 
-	if (x != out_buffer_index) {
-	    print_error("cannot write to output file: %s", strerror(errno));
-	    return 1;
-	}
+        if (x != out_buffer_index) {
+            print_error("cannot write to output file: %s", strerror(errno));
+            return 1;
+        }
     }
 
     return 0;
 }
 
 int
-diff_restore(const options_t * const opts, resources_t * const res)
+diff_restore(const options_t *const opts, resources_t *const res)
 {
     /* Check validity of the reference file */
     if (!is_reference_file_valid(res, opts->sector_size)) {
-	return 1;
+        return 1;
     }
 
     const long ref_size = file_size(res->ref_file);
 
     if (ref_size < 0) {
-	print_error("cannot get size of reference file: %s", strerror(errno));
-	return 1;
+        print_error("cannot get size of reference file: %s", strerror(errno));
+        return 1;
     }
 
     /* Allocate the buffer for data from the reference file */
     /* The reference buffer contains also the offsets */
-    const size_t ref_buffer_size = ((opts->buffer_size / opts->sector_size) * sizeof(uint64_t)) +
-	opts->buffer_size;
+    const size_t ref_buffer_size =
+        ((opts->buffer_size / opts->sector_size) * sizeof(uint64_t)) +
+        opts->buffer_size;
 
-    if ((res->ref_buffer = (char *) malloc(ref_buffer_size)) == NULL) {
-	print_error("cannot allocate buffer for reference file data");
-	return 1;
+    if ((res->ref_buffer = (char *)malloc(ref_buffer_size)) == NULL) {
+        print_error("cannot allocate buffer for reference file data");
+        return 1;
     }
 
     /* Restore data from the differential image */
@@ -292,49 +310,50 @@ diff_restore(const options_t * const opts, resources_t * const res)
 
     for (;;) {
         /* Read data of the offset and the next sector */
-        const size_t ref_read = fread(res->ref_buffer, ref_buffer_size, 1U, res->ref_file);
-
-	if (feof(res->ref_file)) {
-	    break;
-	} else if ((ref_read != 1U) || ferror(res->ref_file)) {
-    	    print_error("cannot read from reference file: %s", strerror(errno));
-	    return 1;
-    	}
-
-	/* Get offset */
-	out_offset = le64toh(*((uint64_t *) res->ref_buffer));
-
-    	if (fseek(res->out_file, out_offset, SEEK_SET) != 0) {
-    	    print_error("cannot seek in output file: %s", strerror(errno));
-    	    return 1;
-    	}
-
-	/* Write the sector data to the output file */
-    	const size_t out_written = fwrite(res->ref_buffer + sizeof(out_offset), opts->sector_size,
-    					  1U, res->out_file);
-
-    	if (out_written != 1U) {
-    	    print_error("cannot write to output file: %s", strerror(errno));
-    	    return 1;
-    	}
+        const size_t ref_read =
+            fread(res->ref_buffer, ref_buffer_size, 1U, res->ref_file);
+
+        if (feof(res->ref_file)) {
+            break;
+        } else if ((ref_read != 1U) || ferror(res->ref_file)) {
+            print_error("cannot read from reference file: %s", strerror(errno));
+            return 1;
+        }
+
+        /* Get offset */
+        out_offset = le64toh(*((uint64_t *)res->ref_buffer));
+
+        if (fseek(res->out_file, out_offset, SEEK_SET) != 0) {
+            print_error("cannot seek in output file: %s", strerror(errno));
+            return 1;
+        }
+
+        /* Write the sector data to the output file */
+        const size_t out_written = fwrite(res->ref_buffer + sizeof(out_offset),
+                                          opts->sector_size, 1U, res->out_file);
+
+        if (out_written != 1U) {
+            print_error("cannot write to output file: %s", strerror(errno));
+            return 1;
+        }
     }
 
     /* The reference file must be read completely */
     if (ftell(res->ref_file) != ref_size) {
-    	print_error("reference file is not valid");
-	return 1;
+        print_error("reference file is not valid");
+        return 1;
     }
 
     return 0;
 }
 
 int
-main(int argc, char ** argv)
+main(int argc, char **argv)
 {
     options_t opts;
 
     if (options_parse(argc, argv, &opts) || opts.help) {
-	usage(1);
+        usage(1);
     }
 
     const bool is_action_backup = (opts.in_file_path != NULL);
@@ -343,10 +362,10 @@ main(int argc, char ** argv)
     resources_init(&res);
 
     if (open_files(&opts, &res, is_action_backup) != 0) {
-	clean_exit(&res, 1);
+        clean_exit(&res, 1);
     } else if (is_action_backup) {
         clean_exit(&res, diff_backup(&opts, &res));
     } else {
-	clean_exit(&res, diff_restore(&opts, &res));
+        clean_exit(&res, diff_restore(&opts, &res));
     }
 }
-- 
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