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flashrom.c: Move write_buf_to_file() to helpers_fileio.c

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Constructing a written file from a buffer is auxiliary
functionality to the core flashrom algorithms. Move
aside to decrease the overall complexity of flashrom.c

BUG=b:242246291
TEST=builds

Change-Id: Ib613e74597d4bdd689043ba93aeb6a87ec80cc14
Signed-off-by: Edward O'Callaghan <quasisec@google.com>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/66646
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Evan Benn <evanbenn@google.com>
Reviewed-by: Sam McNally <sammc@google.com>
Reviewed-by: Thomas Heijligen <src@posteo.de>
This commit is contained in:
Edward O'Callaghan 2022-08-15 10:53:32 +10:00 committed by Edward O'Callaghan
parent 3c1aa889d8
commit c9ebfad95f
2 changed files with 61 additions and 64 deletions
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64
flashrom.c
View File

@ -21,10 +21,6 @@
#include <stdio.h>
#include <sys/types.h>
#ifndef __LIBPAYLOAD__
#include <fcntl.h>
#include <sys/stat.h>
#endif
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
@ -909,66 +905,6 @@ int read_buf_from_include_args(const struct flashrom_layout *const layout, unsig
return 0;
}
/**
* @brief Writes passed data buffer into a file
*
* @param buf Buffer with data to write
* @param size Size of buffer
* @param filename File path to write to
* @return 0 on success
*/
int write_buf_to_file(const unsigned char *buf, unsigned long size, const char *filename)
{
#ifdef __LIBPAYLOAD__
msg_gerr("Error: No file I/O support in libpayload\n");
return 1;
#else
FILE *image;
int ret = 0;
if (!filename) {
msg_gerr("No filename specified.\n");
return 1;
}
if ((image = fopen(filename, "wb")) == NULL) {
msg_gerr("Error: opening file \"%s\" failed: %s\n", filename, strerror(errno));
return 1;
}
unsigned long numbytes = fwrite(buf, 1, size, image);
if (numbytes != size) {
msg_gerr("Error: file %s could not be written completely.\n", filename);
ret = 1;
goto out;
}
if (fflush(image)) {
msg_gerr("Error: flushing file \"%s\" failed: %s\n", filename, strerror(errno));
ret = 1;
}
// Try to fsync() only regular files and if that function is available at all (e.g. not on MinGW).
#if defined(_POSIX_FSYNC) && (_POSIX_FSYNC != -1)
struct stat image_stat;
if (fstat(fileno(image), &image_stat) != 0) {
msg_gerr("Error: getting metadata of file \"%s\" failed: %s\n", filename, strerror(errno));
ret = 1;
goto out;
}
if (S_ISREG(image_stat.st_mode)) {
if (fsync(fileno(image))) {
msg_gerr("Error: fsyncing file \"%s\" failed: %s\n", filename, strerror(errno));
ret = 1;
}
}
#endif
out:
if (fclose(image)) {
msg_gerr("Error: closing file \"%s\" failed: %s\n", filename, strerror(errno));
ret = 1;
}
return ret;
#endif
}
/**
* @brief Writes content from buffer to one or more files.
*

61
helpers_fileio.c
View File

@ -21,6 +21,7 @@
#include <errno.h>
#ifndef __LIBPAYLOAD__
#include <fcntl.h>
#include <sys/stat.h>
#endif
@ -69,3 +70,63 @@ out:
return ret;
#endif
}
/**
* @brief Writes passed data buffer into a file
*
* @param buf Buffer with data to write
* @param size Size of buffer
* @param filename File path to write to
* @return 0 on success
*/
int write_buf_to_file(const unsigned char *buf, unsigned long size, const char *filename)
{
#ifdef __LIBPAYLOAD__
msg_gerr("Error: No file I/O support in libpayload\n");
return 1;
#else
FILE *image;
int ret = 0;
if (!filename) {
msg_gerr("No filename specified.\n");
return 1;
}
if ((image = fopen(filename, "wb")) == NULL) {
msg_gerr("Error: opening file \"%s\" failed: %s\n", filename, strerror(errno));
return 1;
}
unsigned long numbytes = fwrite(buf, 1, size, image);
if (numbytes != size) {
msg_gerr("Error: file %s could not be written completely.\n", filename);
ret = 1;
goto out;
}
if (fflush(image)) {
msg_gerr("Error: flushing file \"%s\" failed: %s\n", filename, strerror(errno));
ret = 1;
}
// Try to fsync() only regular files and if that function is available at all (e.g. not on MinGW).
#if defined(_POSIX_FSYNC) && (_POSIX_FSYNC != -1)
struct stat image_stat;
if (fstat(fileno(image), &image_stat) != 0) {
msg_gerr("Error: getting metadata of file \"%s\" failed: %s\n", filename, strerror(errno));
ret = 1;
goto out;
}
if (S_ISREG(image_stat.st_mode)) {
if (fsync(fileno(image))) {
msg_gerr("Error: fsyncing file \"%s\" failed: %s\n", filename, strerror(errno));
ret = 1;
}
}
#endif
out:
if (fclose(image)) {
msg_gerr("Error: closing file \"%s\" failed: %s\n", filename, strerror(errno));
ret = 1;
}
return ret;
#endif
}